Materialize the trash — store, undo, and the container universe

Phase 2 swaps every consumer: Liveness and its ancestor walk are gone,
replaced by ItemContainer — a UUID set plus the container side it
lives on, presence the whole test, one selection boundary instead of
the old liveness law. Deletion stages by place: board cards move to
the trash at a store-minted head rank, trash-side delete is permanent
behind its confirmation, Delete Immediately skips the trash from
anywhere, lane delete captures the subtree and removes the folder.
Restore has no method at all — moveCards resolves members in either
container, so drag-out and cut-paste are the ordinary moves 13 calls
them, registering ordinary Move steps. The delete inverse moves the
card back to its captured lane and rank; redo replays the captured
trash rank, a value the gesture actually wrote; lane undo recreates
the subtree byte-faithfully in session. Purges register nothing —
where 13's trash section contradicts its own Rules on that, Rules
wins, filed for ruling. Staleness collapsed to present-or-absent: a
container is a path, so a foreign restore fails the delete step's
expectation structurally. Legacy tombstones migrate on the loose-file
tail hook, cards oldest-first so minting above top reproduces the
retired newest-first column, lanes returning live, one folded loss
row naming both directions. Put Back, restoreByDrag,
receiveRestoredCards, TrashEntry, and the kind machinery are deleted;
the trash column renders the container correctly with its full face
rework left to phase 3.

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

Kanban/App/AppCommands.swift

@@ -347,7 +347,7 @@ struct RevealInFinderCommand: View {
         if let store {
             let ids = store.selection.ids
             guard !ids.isEmpty else { return [store.rootURL] }
-            return TrashModel.paths(of: ids, on: store.selection.liveness, in: store.snapshot)
+            return ItemPath.resolve(ids, in: store.selection.container, snapshot: store.snapshot)
                 .map { $0.folder(under: store.rootURL) }
         }
         if let attachments {

Kanban/App/AppModel.swift

@@ -645,11 +645,9 @@ public final class AppModel {
     public static func liveCounts(of snapshot: BoardModel) -> (lanes: Int, cards: Int) {
         var lanes = 0
         var cards = 0
-        for lane in snapshot.lanes where !lane.isDeleted {
+        for lane in snapshot.lanes {
             lanes += 1
-            for card in lane.cards where !card.isDeleted {
+            cards += lane.cards.count
-                cards += 1
-            }
         }
         return (lanes, cards)
     }

Kanban/App/CardWindowHost.swift

@@ -175,9 +175,7 @@ struct CardWindowHost: View {
         let identity = ItemID(rawValue: cardID)
         for lane in snapshot.lanes {
             guard let card = lane.cards.first(where: { $0.id == identity }) else { continue }
-            return lane.isDeleted || card.isDeleted
+            return .shows(CardPlacement(card: card, lane: lane))
-                ? .dismisses
-                : .shows(CardPlacement(card: card, lane: lane))
         }
         return .dismisses
     }
@@ -319,7 +317,7 @@ struct CardWindowHost: View {
     /// links resolve against (05-card-window.md ▸ Preview).
     ///
     /// Built off the store's *current* `rootURL` rather than the ref's captured one, for
-    /// `BoardStore.liveItem`'s reason: a mid-session folder rename moves the board, and a preview
+    /// `BoardStore.boardItem`'s reason: a mid-session folder rename moves the board, and a preview
     /// resolving images against where the board used to be would quietly stop showing them.
     static func cardFolder(root: URL, placement: CardPlacement) -> URL {
         root

Kanban/App/ClipboardManifest.swift

@@ -27,7 +27,7 @@ extension UTType {
 ///   snapshot is missing or unreadable — "the staging-less fallback: content intact, attachments
 ///   absent", announced by a banner rather than discovered later.
 ///
-/// `kind` and `side` are the selection's own vocabulary (`SelectionKind`, `Liveness`) rather than
+/// `kind` and `container` are the selection's own vocabulary (`SelectionKind`, `ItemContainer`) rather than
 /// near-copies of it: a clipboard payload is a selection that was copied, and the cards-XOR-lanes and
 /// live-XOR-tombstoned invariants are exactly the ones those two types already carry. Their raw
 /// spellings are pasteboard API — a manifest written before a quit is decoded after the relaunch.
@@ -53,7 +53,7 @@ public struct ClipboardManifest: Codable, Sendable, Equatable {
     public var boardRoot: String
 
     public var kind: SelectionKind
-    public var side: Liveness
+    public var container: ItemContainer
     public var entries: [Entry]
 
     /// One copied item: where its snapshot is staged, what it is called, and its bytes.
@@ -132,14 +132,14 @@ public struct ClipboardManifest: Codable, Sendable, Equatable {
         copyID: String,
         boardRoot: URL,
         kind: SelectionKind,
-        side: Liveness,
+        container: ItemContainer,
         entries: [Entry]
     ) {
         self.version = version
         self.copyID = copyID
         self.boardRoot = boardRoot.path
         self.kind = kind
-        self.side = side
+        self.container = container
         self.entries = entries
     }
 

Kanban/App/ClipboardStore.swift

@@ -192,7 +192,7 @@ public final class ClipboardStore {
             copyID: copyID,
             boardRoot: store.rootURL,
             kind: capture.kind,
-            side: capture.side,
+            container: capture.container,
             entries: capture.subjects.map(\.entry)
         )
         guard let data = manifest.encoded() else { return }
@@ -209,7 +209,7 @@ public final class ClipboardStore {
             armedCut = ArmedCut(copyID: copyID, source: store)
             store.transient.pendingCut = ItemReferenceSet(
                 ids: Set(capture.subjects.map(\.id)),
-                liveness: capture.side
+                container: capture.container
             )
         }
         // "A sweep at launch and on each copy purges entries the pasteboard no longer references."
@@ -219,8 +219,9 @@ public final class ClipboardStore {
 
     // MARK: - Availability
 
-    /// Whether Edit ▸ Copy applies — a non-empty selection that still names something the board
+    /// Whether Edit ▸ Copy applies — a non-empty selection that still names something, in either
-    /// renders, on either side of the live/tombstoned boundary.
+    /// container ("⌘C copies a trash card — a live copy lands wherever pasted, like copying out of
+    /// Finder's Trash" — 04-interactions.md ▸ The trash).
     ///
     /// **The read-only lock deliberately does not close it**: "reading, selecting, searching and
     /// copying out all stay live" (02-architecture.md § The lock's scope) — a copy is a read. The
@@ -233,12 +234,15 @@ public final class ClipboardStore {
         return SelectionGrammar.kind(of: store.selection, in: store.snapshot) != nil
     }
 
-    /// Whether Edit ▸ Cut applies. Copy's conditions, plus the two a *move* adds: the board must
+    /// Whether Edit ▸ Cut applies. Copy's conditions plus the one a *move* adds: the board must
-    /// accept writes (a cut mutates its source), and the selection must be **live** — "⌘X is
+    /// accept writes, since a cut mutates its source.
-    /// disabled: the move-out vocabulary is Put Back or drag-to-restore, nothing else" (04 ▸ The
+    ///
-    /// trash).
+    /// **The trash no longer disqualifies it** (04-interactions.md ▸ The trash, resettled
+    /// 2026-07-28): "⌘X works — it was disabled under the tombstone model: cut in the trash, paste
+    /// into a lane is the keyboard-native restore, an ordinary folder move". So there is no
+    /// container clause here at all, which is the pivot showing up as a deleted line.
     public func canCut(from store: BoardStore) -> Bool {
-        canCopy(from: store) && !store.isReadOnly && store.selection.liveness == .live
+        canCopy(from: store) && !store.isReadOnly
     }
 
     /// Whether Edit ▸ Paste applies to `store`.
@@ -347,7 +351,6 @@ public final class ClipboardStore {
                     operation: .move,
                     toLane: target.laneID,
                     at: target.index,
-                    clearingTombstones: false,
                     normalizingLooseFiles: true
                 )
             case let .lanes(index):
@@ -355,7 +358,6 @@ public final class ClipboardStore {
                     sources,
                     operation: .move,
                     at: index,
-                    clearingTombstones: false,
                     normalizingLooseFiles: true
                 )
             }
@@ -389,9 +391,9 @@ public final class ClipboardStore {
             }
         }
 
-        // "⌘C strips `deleted:` at materialization" (04 ▸ The trash) — the trash's copy-out-only rule,
+        // A card copied out of the trash needs nothing done to it on arrival: it carries no
-        // and the one axis a paste varies that a within-board drop never does.
+        // `deleted:` key, because there is no such key any more (03-board-ui.md § Trash, resettled
-        let clearingTombstones = manifest.side == .trashed
+        // 2026-07-28). The tombstone era's strip-at-materialization axis is gone with it.
         switch plan {
         case let .cards(target):
             store.receiveCards(
@@ -399,7 +401,6 @@ public final class ClipboardStore {
                 operation: .copy,
                 toLane: target.laneID,
                 at: target.index,
-                clearingTombstones: clearingTombstones,
                 normalizingLooseFiles: true
             )
         case let .lanes(index):
@@ -407,7 +408,6 @@ public final class ClipboardStore {
                 sources,
                 operation: .copy,
                 at: index,
-                clearingTombstones: clearingTombstones,
                 normalizingLooseFiles: true
             )
         }
@@ -427,10 +427,11 @@ public final class ClipboardStore {
         let survivors = source.transient.pendingCut
         guard !survivors.isEmpty else { return nil }
 
-        // `TrashModel.paths` walks lanes in board order and each lane's cards in card order, which is
+        // `ItemPath.resolve` walks the container in display order, which is the flatten order the
-        // the flatten order the drop commits insert in — and the pending cut is homogeneous by kind,
+        // drop commits insert in — and the pending cut is homogeneous by container, so it is asked
-        // so only one of its two branches ever contributes.
+        // for exactly the side the cut was made on. A cut made in the trash therefore hands the
-        let folders = TrashModel.paths(of: survivors.ids, on: .live, in: source.snapshot)
+        // paste the trash folders it must move out, which is the keyboard restore (04 ▸ The trash).
+        let folders = ItemPath.resolve(survivors.ids, in: survivors.container, snapshot: source.snapshot)
             .map { $0.folder(under: source.rootURL) }
         guard !folders.isEmpty else { return nil }
         return (source, folders)
@@ -541,17 +542,17 @@ public final class ClipboardStore {
     /// produces.
     struct Subject {
         let id: ItemID
-        let path: TrashModel.ItemPath
+        let path: ItemPath
         let entry: ClipboardManifest.Entry
     }
 
     /// The selection, resolved into copy subjects in the order the clipboard records them — or `nil`
-    /// when it names nothing the board renders on its own side.
+    /// when it names nothing its container holds.
     ///
-    /// **The order is `SelectionGrammar.order`'s**, which is already the right answer for all four
+    /// **The order is `SelectionGrammar.order`'s**, which is already the right answer for every
-    /// (side, kind) pairs: flatten order for live cards, left-to-right for live lanes, and the trash's
+    /// (container, kind) pair: flatten order for board cards, left-to-right for lanes, and the
-    /// own deterministic sort for either kind of entry. Deriving it here would be a fifth definition
+    /// trash's own `order` for trash cards. Deriving it here would be a second definition of an order
-    /// of an order the app already states once.
+    /// the app already states once.
     ///
     /// **The index text comes from the snapshot, not from disk.** `FrontmatterDocument` edits by line
     /// span, so `serialized()` on an untouched document returns the file's bytes exactly — which
@@ -560,45 +561,18 @@ public final class ClipboardStore {
     static func capture(
         selection: ItemReferenceSet,
         snapshot: BoardModel
-    ) -> (kind: SelectionKind, side: Liveness, subjects: [Subject])? {
+    ) -> (kind: SelectionKind, container: ItemContainer, subjects: [Subject])? {
         guard let kind = SelectionGrammar.kind(of: selection, in: snapshot) else { return nil }
-        let side = selection.liveness
+        let container = selection.container
-        let ordered = SelectionGrammar.order(of: kind, on: side, in: snapshot)
+        let ordered = SelectionGrammar.order(of: kind, in: container, snapshot: snapshot)
             .filter { selection.ids.contains($0) }
         guard !ordered.isEmpty else { return nil }
 
         var subjects: [ItemID: Subject] = [:]
-        for lane in snapshot.lanes {
+        func addCard(_ card: Card, at path: ItemPath) {
-            if kind == .lane, Liveness(isDeleted: lane.isDeleted) == side {
-                subjects[lane.id] = Subject(
-                    id: lane.id,
-                    path: TrashModel.ItemPath(laneID: lane.id, cardID: nil),
-                    entry: ClipboardManifest.Entry(
-                        id: lane.id.rawValue,
-                        folder: lane.id.rawValue,
-                        title: lane.title.value,
-                        index: lane.document.serialized(),
-                        attachmentCount: 0,
-                        // Live cards only — a lane copy strips tombstoned cards, and the fallback
-                        // only ever materializes a copy (see `ClipboardManifest.Entry.cards`).
-                        cards: lane.cards.filter { !$0.isDeleted }.map { card in
-                            ClipboardManifest.Entry.Card(
-                                id: card.id.rawValue,
-                                title: card.title.value,
-                                index: card.document.serialized(),
-                                attachmentCount: card.attachments.count
-                            )
-                        }
-                    )
-                )
-            }
-            // A tombstoned lane subsumes its subtree on both sides: its cards render nowhere live and
-            // have no trash row of their own, so they are nobody's copy subject.
-            guard kind == .card, !lane.isDeleted else { continue }
-            for card in lane.cards where Liveness(isDeleted: card.isDeleted) == side {
             subjects[card.id] = Subject(
                 id: card.id,
-                    path: TrashModel.ItemPath(laneID: lane.id, cardID: card.id),
+                path: path,
                 entry: ClipboardManifest.Entry(
                     id: card.id.rawValue,
                     folder: card.id.rawValue,
@@ -608,10 +582,47 @@ public final class ClipboardStore {
                 )
             )
         }
+
+        switch container {
+        case .trash:
+            for card in snapshot.trash {
+                addCard(card, at: .trashCard(card.id))
+            }
+        case .board:
+            for lane in snapshot.lanes {
+                if kind == .lane {
+                    subjects[lane.id] = Subject(
+                        id: lane.id,
+                        path: .lane(lane.id),
+                        entry: ClipboardManifest.Entry(
+                            id: lane.id.rawValue,
+                            folder: lane.id.rawValue,
+                            title: lane.title.value,
+                            index: lane.document.serialized(),
+                            attachmentCount: 0,
+                            // Every card the lane has — "a lane carries exactly its cards", and the
+                            // trash is board-level, so there is nothing nested to strip
+                            // (04-interactions.md ▸ Drag and drop, resettled 2026-07-28).
+                            cards: lane.cards.map { card in
+                                ClipboardManifest.Entry.Card(
+                                    id: card.id.rawValue,
+                                    title: card.title.value,
+                                    index: card.document.serialized(),
+                                    attachmentCount: card.attachments.count
+                                )
+                            }
+                        )
+                    )
+                    continue
+                }
+                for card in lane.cards {
+                    addCard(card, at: .card(lane: lane.id, id: card.id))
+                }
+            }
         }
 
         let resolved = ordered.compactMap { subjects[$0] }
         guard !resolved.isEmpty else { return nil }
-        return (kind, side, resolved)
+        return (kind, container, resolved)
     }
 }

Kanban/History/BoardStoreHistory.swift

@@ -110,7 +110,7 @@ extension BoardStore {
         // gone is not one to pop: the stack is about to be cleared with the session anyway.
         guard let store else { return .failed }
 
-        guard HistoryStaleness.isCurrent(expectations, under: store.rootURL) else {
+        guard HistoryStaleness.isCurrent(expectations) else {
             store.banners.postSkippedStep(direction, subject: subject)
             return .skipped
         }
@@ -157,11 +157,11 @@ extension BoardStore {
 
     /// Registers a create's step: undo removes the folders, redo puts them back byte-for-byte.
     ///
-    /// **Removal, not a tombstone**, exactly as 13 words it: an undone create leaves *no trace*,
+    /// **Removal, not a move into the trash**, exactly as 13 words it: an undone create leaves *no
-    /// because the item was born of the gesture being undone — a tombstone would leave a trash row
+    /// trace*, because the item was born of the gesture being undone — filing it in the trash would
-    /// for a card the user never really made. `purgeIsUnrecoverable` is untouched by this: that flag
+    /// leave a card the user never really made for them to find. `purgeIsUnrecoverable` is untouched
-    /// is about Delete Immediately, whose loss is the user's own final gesture, while this loss is
+    /// by this: that flag is about Delete Immediately, whose loss is the user's own final gesture,
-    /// one ⇧⌘Z away.
+    /// while this loss is one ⇧⌘Z away.
     ///
     /// The honest edge, recorded rather than papered over: anything that happened *inside* the
     /// created folder through an operation that registers no step of its own — an attachment added by
@@ -169,19 +169,19 @@ extension BoardStore {
     /// 13's own two rulings (remove the folder; attachment operations register nothing in v1) rather
     /// than from anything decided here.
     ///
-    /// **Its staleness predicate is existence and liveness, and deliberately nothing else** (13:
+    /// **Its staleness predicate is existence, and deliberately nothing else** (13: "existence …
-    /// "existence/liveness for create/delete/restore steps"). A create's after-value *is* the item's
+    /// for create/delete/restore steps"). A create's after-value *is* the item's being there, so the
-    /// being there, so the undo validates that the folders are still there and still live and the
+    /// undo validates that the folders are still at their paths and the redo that they are still
-    /// redo that they are still gone. The same honest edge follows: a foreign *edit* inside a created
+    /// gone. The same honest edge follows: a foreign *edit* inside a created card does not stop ⌘Z
-    /// card does not stop ⌘Z from removing it, because the create never wrote that field — while a
+    /// from removing it, because the create never wrote that field — while a foreign *delete* does,
-    /// foreign *delete* does, since the trash row the user is looking at is not this step's to purge.
+    /// since the card the user is looking at in the trash is at a different path now.
     func registerCreation(_ items: [CreatedItem], kind: HistoryPhrase.Kind, subject: String? = nil) {
         guard !items.isEmpty else { return }
         let operation: WriteOperation = kind == .lane ? .createLane : .createCard
         registerStep(
             HistoryPhrase.name(.add, kind: kind, count: items.count),
             subject: subject,
-            undoExpects: items.map { .live($0.folder) },
+            undoExpects: items.map { .present($0.folder) },
             redoExpects: items.map { .absent($0.folder) }
         ) { _ in
             // Reversed, so a lane and a card created by one gesture unwind child-first — the same
@@ -282,14 +282,4 @@ extension BoardStore {
         }
     }
 
-    /// Puts an item's tombstone back — **with the timestamp it carried**, not with `now`.
-    ///
-    /// The inverse of Put Back is the item returning to the trash exactly where it was, and the trash
-    /// sorts by `deleted` (03-board-ui.md § Trash ▸ Contents): re-stamping would file the row under
-    /// today and quietly reorder a list the user was reading. A prior that was malformed (or, by
-    /// construction impossibly, missing) falls back to `now` — the item has to be tombstoned, and an
-    /// unreadable timestamp is not a value to preserve.
-    static func restoreTombstone(_ prior: FieldValue<Date>, in document: inout FrontmatterDocument) {
-        document.set(FrontmatterKeys.deleted, to: .date(prior.value ?? Date()))
-    }
 }

Kanban/History/HistoryStaleness.swift

@@ -43,40 +43,42 @@ public enum ExpectedField: Sendable, Equatable {
 /// What one folder must currently hold for a step to be safe to cross — the state that step's write
 /// left it in.
 ///
-/// Two halves, both of them 13's: **existence and liveness** ("target folder gone ... → the step is
+/// Two halves, both of them 13's: **existence** ("target folder gone ... → the step is skipped"),
-/// skipped"; "existence/liveness for create/delete/restore steps"), and the **field-level**
+/// and the **field-level** comparison above. A step carries one of these per item it touched, so a
-/// comparison above. A step carries one of these per item it touched, so a multi-card move validates
+/// multi-card move validates three targets and a single rename validates one — which is the whole of
-/// three targets and a single rename validates one — which is the whole of "a foreign change to an
+/// "a foreign change to an unrelated item must not skip anything": an item no step named is an item
-/// unrelated item must not skip anything": an item no step named is an item no expectation mentions.
+/// no expectation mentions.
 ///
-/// **The folder's *path* is the parent check.** A move's step expects the card at its destination
+/// ### The container side rides in the folder path
-/// path; a card that a foreign writer moved elsewhere leaves nothing at that path, so the ordinary
+///
-/// existence half already answers "moved away" without a parent field of its own.
+/// **The folder's *path* is the parent check**, and since the trash was materialized that check is
+/// also the container check (03-board-ui.md § Trash, resettled 2026-07-28). A delete step's undo
+/// expects its card at `<root>/.trash/<id>`; a foreign restore moves the folder out, so nothing is
+/// at that path and the existence half already answers "the card is not in the trash any more".
+/// The mirror holds: the redo expects it back at `<root>/<lane>/<id>`, where a foreign re-delete
+/// leaves nothing. That is why `Presence` is a two-case answer rather than the tombstone era's
+/// three-way live/tombstoned/absent reading of a `deleted:` key — there is no key to read, and no
+/// ancestor to walk to find one.
 public struct HistoryExpectation: Sendable, Equatable {
 
     /// Where the item this step wrote to should be — the destination for a move, the item's own
     /// folder for everything else, and the board root for the board's own rename and styling.
     public let folder: URL
 
-    /// Whether the item should be there, and if so on which side of the tombstone.
+    /// Whether the item should be there.
     public let presence: Presence
 
     /// The fields the step's write set, with the values it set them to. Empty for a step whose
-    /// whole subject *is* existence — a create, a delete, a Put Back.
+    /// whole subject *is* existence — a create, a lane delete.
     public let fields: [ExpectedField]
 
-    /// Where an item stands, as the trash's own three-way reading of it.
+    /// Whether anything is at this path.
     public enum Presence: Sendable, Equatable {
-        /// There, and rendered: no `deleted:` on the item **or on any ancestor**. Liveness is
+        /// There, with a readable `index.md`. Which container that is, is the path's own answer.
-        /// effective, the same ancestor walk `BoardStore.liveItem` and the card windows' fate rule
+        case present
-        /// apply — a card under a tombstoned lane renders nowhere, so it is as gone as a deleted one.
-        case live
 
-        /// There, and tombstoned — a trash row, or a card hidden under a tombstoned lane.
+        /// Not there at all: the folder is gone. What an undone create and an undone lane delete
-        case tombstoned
+        /// leave, and what a redone one expects to find before putting it back.
-
-        /// Not there at all: the folder is gone. What an undone create leaves, and what a redone one
-        /// expects to find before putting it back.
         case absent
     }
 
@@ -86,37 +88,21 @@ public struct HistoryExpectation: Sendable, Equatable {
         self.fields = fields
     }
 
-    /// The item is live and its fields say what the step set them to.
+    /// The item is at this path and its fields say what the step set them to.
-    public static func live(_ folder: URL, _ fields: ExpectedField...) -> HistoryExpectation {
+    public static func present(_ folder: URL, _ fields: ExpectedField...) -> HistoryExpectation {
-        HistoryExpectation(folder: folder, presence: .live, fields: fields)
+        HistoryExpectation(folder: folder, presence: .present, fields: fields)
     }
 
     /// The same, for a caller whose field list is computed — the styling gesture's, which varies per
-    /// dimension. A label rather than a second variadic, so `.live(folder)` stays unambiguous.
+    /// dimension. A label rather than a second variadic, so `.present(folder)` stays unambiguous.
-    public static func live(_ folder: URL, fields: [ExpectedField]) -> HistoryExpectation {
+    public static func present(_ folder: URL, fields: [ExpectedField]) -> HistoryExpectation {
-        HistoryExpectation(folder: folder, presence: .live, fields: fields)
+        HistoryExpectation(folder: folder, presence: .present, fields: fields)
-    }
-
-    /// The item is tombstoned and its fields say what the step set them to.
-    public static func tombstoned(_ folder: URL, _ fields: ExpectedField...) -> HistoryExpectation {
-        HistoryExpectation(folder: folder, presence: .tombstoned, fields: fields)
     }
 
     /// Nothing is at this path.
     public static func absent(_ folder: URL) -> HistoryExpectation {
         HistoryExpectation(folder: folder, presence: .absent, fields: [])
     }
-
-    /// The variant for a step whose target's liveness is not known until the gesture runs — the Edit
-    /// session's, which is registered against a card that may have been tombstoned out from under
-    /// the buffer (05-card-window.md ▸ Deletion & lifecycle).
-    public static func item(
-        _ folder: URL,
-        tombstoned: Bool,
-        _ fields: ExpectedField...
-    ) -> HistoryExpectation {
-        HistoryExpectation(folder: folder, presence: tombstoned ? .tombstoned : .live, fields: fields)
-    }
 }
 
 // MARK: - HistoryStaleness
@@ -140,29 +126,29 @@ public struct HistoryExpectation: Sendable, Equatable {
 /// (settled — ruled 2026-07-27): staleness is discovered at ⌘Z time, never by background pruning ...
 /// The stack always looks full". This type has exactly one caller, `BoardStore.cross`, one line
 /// before the inverse would have been written.
+///
+/// ### It needs no board root
+///
+/// The tombstone era's liveness half walked a folder's ancestors looking for a `deleted:` key, and
+/// needed the root to know where to stop. Materializing the trash removed the walk: an item's
+/// container is its path, and a path is checked by asking the filesystem whether anything is there.
 public enum HistoryStaleness {
 
     /// Whether every target a step named still holds what that step left there.
-    ///
+    public static func isCurrent(_ expectations: [HistoryExpectation]) -> Bool {
-    /// `root` is the board's current root, which the liveness walk stops at — a lane's parent.
+        expectations.allSatisfy(isCurrent)
-    public static func isCurrent(_ expectations: [HistoryExpectation], under root: URL) -> Bool {
-        expectations.allSatisfy { isCurrent($0, under: root) }
     }
 
     /// One target's answer.
     ///
-    /// A file that cannot be read or parsed fails every expectation but `.absent`: an `index.md`
+    /// A file that cannot be read or parsed fails a `.present` expectation: an `index.md` somebody
-    /// somebody has just broken is not one holding this step's after-value, and the honest reading of
+    /// has just broken is not one holding this step's after-value, and the honest reading of "the
-    /// "the field no longer holds it" covers a field that can no longer be read at all.
+    /// field no longer holds it" covers a field that can no longer be read at all.
-    public static func isCurrent(_ expectation: HistoryExpectation, under root: URL) -> Bool {
+    public static func isCurrent(_ expectation: HistoryExpectation) -> Bool {
         guard expectation.presence != .absent else {
             return !FileManager.default.fileExists(atPath: expectation.folder.path)
         }
         guard let document = index(at: expectation.folder) else { return false }
-
-        let tombstoned = isEffectivelyTombstoned(expectation.folder, document: document, under: root)
-        guard tombstoned == (expectation.presence == .tombstoned) else { return false }
-
         return expectation.fields.allSatisfy { matches($0, in: document) }
     }
 
@@ -192,40 +178,6 @@ public enum HistoryStaleness {
         }
     }
 
-    // MARK: Liveness
-
-    /// Whether the item at `folder` renders — **presence of `deleted:`, not its validity**
-    /// (`Lane.isDeleted`'s rule), walked up through the ancestors the way every other liveness
-    /// question in this app is.
-    ///
-    /// The board root is never tombstoned however its own frontmatter reads: a board-level `deleted:`
-    /// is a tolerated load *warning* (01-storage-format.md § Deletion), not a state that hides the
-    /// board from itself.
-    private static func isEffectivelyTombstoned(
-        _ folder: URL,
-        document: FrontmatterDocument,
-        under root: URL
-    ) -> Bool {
-        guard !isRoot(folder, root) else { return false }
-        guard document.deleted.isMissing else { return true }
-
-        // Lane and card are the only levels below the root, so this walks at most twice; the bound
-        // is there so a folder that is not under this root at all (a step registered before a
-        // mid-session root change) ends rather than climbing to `/`.
-        var parent = folder.deletingLastPathComponent()
-        for _ in 0 ..< 4 {
-            guard !isRoot(parent, root) else { return false }
-            guard let ancestor = index(at: parent) else { return false }
-            if !ancestor.deleted.isMissing { return true }
-            parent = parent.deletingLastPathComponent()
-        }
-        return false
-    }
-
-    private static func isRoot(_ folder: URL, _ root: URL) -> Bool {
-        folder.standardizedFileURL.path == root.standardizedFileURL.path
-    }
-
     // MARK: Reading
 
     /// The item's `index.md` as the app reads it, or `nil` when there is no readable, parseable one

Kanban/LiveStore/BannerCenter.swift

@@ -416,6 +416,27 @@ public final class BannerCenter {
         postLoss(message)
     }
 
+    /// **The legacy tombstone migration** (01-storage-format.md § Deletion, resettled 2026-07-28:
+    /// "Legacy `deleted:` keys migrate on load-and-write, never destroy … a graceful warning-tone
+    /// notice"): a board written by an older version carried `deleted:` keys, the app moved the
+    /// cards those keys named into `.trash/` and returned the lanes live, and this is the row that
+    /// says so.
+    ///
+    /// **A loss row for `postRelocatedLooseFiles`' exact reason**, and it is the same shape of event:
+    /// the app moved the user's folders on its own initiative, on a board it opened rather than on a
+    /// gesture they made. That must be said out loud, must not evaporate unread, and must not rank
+    /// as an error, because no action failed. The one nuance worth naming: the *lane* half is a
+    /// resurrection rather than a removal — cards nobody asked to see again may reappear on the
+    /// board — which is exactly the kind of surprise this class exists to announce.
+    ///
+    /// `cards` and `lanes` are the migrated items' titles, in the order they were written, `nil` for
+    /// an untitled one — "Untitled" is a rendering, never a value (03-board-ui.md § Card face), so
+    /// the phrasing layer decides what to call it. A migration that migrated nothing posts nothing.
+    public func postMigratedTombstones(cards: [String?], lanes: [String?]) {
+        guard let message = Self.migratedTombstonesMessage(cards: cards, lanes: lanes) else { return }
+        postLoss(message)
+    }
+
     /// Posts the skipped-folders loss row for a Finder drop that imported its files but refused its
     /// folders (04-interactions.md ▸ Selection, drag & drop, "Folders are refused at hover"): "a
     /// mixed drag proposes for its files only, and the drop imports the files while a one-shot
@@ -822,6 +843,59 @@ public final class BannerCenter {
         return "Moved '\(name)' into attachments — \(subject)"
     }
 
+    /// The legacy tombstone migration's line — **one folded sentence for both halves**, written in
+    /// `relocatedLooseFilesMessage`'s voice because it is the same kind of notice: the act first,
+    /// the subject after an em dash, plurals folded, a sole item named.
+    ///
+    /// The two clauses are joined rather than posted as two rows, because it is **one migration**:
+    /// a board opened, its old deletion markers were resolved, and that is one thing that happened
+    /// to the user's files. Two rows would also mean two dismissals for one event, and would rank a
+    /// resurrection and a relocation against each other for no reason.
+    ///
+    /// The shapes, in the relocation's own idiom:
+    ///
+    /// - **One card**, no lanes: "Moved 'Fix login' to the trash — it carried an old deleted marker".
+    /// - **Several cards**: "Moved 3 cards to the trash — they carried old deleted markers".
+    /// - **One lane**, no cards: "Restored 'Doing' — it carried an old deleted marker".
+    /// - **Both**: "Moved 3 cards to the trash and restored 2 lanes — they carried old deleted markers".
+    ///
+    /// **The tail names the cause once**, and it is the whole explanation the row owes: the user did
+    /// not delete anything just now, and without the clause the sentence would read as an action
+    /// they had somehow just taken. The singular/plural of the tail follows the *total*, so the
+    /// mixed case never has to spell a singular (two clauses carry at least two items).
+    ///
+    /// `nil` when nothing migrated — a migration that migrated nothing is not news.
+    public nonisolated static func migratedTombstonesMessage(cards: [String?], lanes: [String?]) -> String? {
+        let total = cards.count + lanes.count
+        guard total > 0 else { return nil }
+
+        var clauses: [String] = []
+        if !cards.isEmpty {
+            let subject = cards.count == 1
+                ? sole(cards[0])
+                : "\(cards.count) cards"
+            clauses.append("Moved \(subject) to the trash")
+        }
+        if !lanes.isEmpty {
+            let subject = lanes.count == 1
+                ? sole(lanes[0])
+                : "\(lanes.count) lanes"
+            clauses.append(clauses.isEmpty ? "Restored \(subject)" : "restored \(subject)")
+        }
+        let tail = total == 1
+            ? "it carried an old deleted marker"
+            : "they carried old deleted markers"
+        return "\(clauses.joined(separator: " and ")) — \(tail)"
+    }
+
+    /// A sole migrated item's name: its title in quotes, or the untitled rendering the relocation
+    /// line already uses ("an untitled card" / "an untitled lane" are one phrase here, because the
+    /// clause it sits in already says which level it is).
+    private nonisolated static func sole(_ title: String?) -> String {
+        guard let title else { return "an untitled item" }
+        return "'\(title)'"
+    }
+
     /// The skipped-step line — 13-native-undo.md ▸ Rules' own example sentence, "Undo skipped — 'Fix
     /// login' changed outside Lanework", with ⇧⌘Z's mirror ("Redo skipped — …").
     ///

Kanban/LiveStore/ItemLocation.swift

@@ -0,0 +1,171 @@
+import Foundation
+
+// MARK: - ItemContainer
+
+/// Which of the board's two **card containers** something sits in — the board's lanes, or the
+/// board's `.trash/`.
+///
+/// **This is the materialized trash's replacement for `Liveness`** (02-architecture.md § Changes
+/// from Kanban, resettled 2026-07-28; 03-board-ui.md § Trash). Deletion is a *move* now, so there is
+/// no flag to read, no ancestor to walk, and no "effective liveness" to compute: an item is in a
+/// container or it is not, and which container is a fact about where its folder sits on disk. The
+/// tombstone model's two-sided machinery — the absolute ancestor walk, the entry-vs-universe split,
+/// kind-homogeneity inside the trash — is retired wholesale with it.
+///
+/// **An item-referencing set carries one of these** (`ItemReferenceSet`), because 04-interactions.md
+/// ▸ The trash keeps exactly one boundary: "a selection never mixes trash cards with board cards — a
+/// single container rule replacing the old liveness law, because Delete would otherwise mean two
+/// different things in one gesture (move-to-trash vs permanent)".
+///
+/// **Lanes live only on the board side.** "Cards only. Lanes are never trashed" (03-board-ui.md §
+/// Trash), so the trash's universe is cards and nothing else — which is why the trash needs no
+/// kind axis of its own any more.
+///
+/// `String`-backed and `Codable` because the clipboard manifest carries one: a manifest written
+/// before a quit is decoded after the relaunch, so these raw spellings are pasteboard API, and they
+/// are the case names so nothing has to remember a second vocabulary.
+public enum ItemContainer: String, Codable, Sendable, Equatable, CaseIterable {
+
+    /// The board proper — every lane, and every card inside a lane.
+    case board
+
+    /// `<root>/.trash/` — the reserved container deletion moves cards into.
+    case trash
+}
+
+extension ItemContainer {
+
+    /// Every id `snapshot` holds in this container — **the universe** every item-referencing set is
+    /// held to (02-architecture.md § Live-reload resilience: "re-resolution matches UUID *and*
+    /// container side ... presence in the snapshot is the whole question").
+    ///
+    /// One walk, no filtering: the board side is the lanes plus their cards, the trash side is
+    /// `snapshot.trash`. There is deliberately no liveness predicate anywhere in here — a legacy
+    /// `deleted:` key still riding in from an unmigrated board (`BoardLoader`'s migration window)
+    /// names an ordinary board card until its folder actually moves, which is the safe direction and
+    /// the one the migration then takes (01-storage-format.md § Deletion).
+    public func ids(in snapshot: BoardModel) -> Set<ItemID> {
+        var universe: Set<ItemID> = []
+        switch self {
+        case .board:
+            for lane in snapshot.lanes {
+                universe.insert(lane.id)
+                for card in lane.cards {
+                    universe.insert(card.id)
+                }
+            }
+        case .trash:
+            for card in snapshot.trash {
+                universe.insert(card.id)
+            }
+        }
+        return universe
+    }
+}
+
+// MARK: - ItemPath
+
+/// Where an item's folder sits under a board root, as identity components rather than as a URL.
+///
+/// **Components, not a URL**, for the reason every path-shaped value in this app is: the caller
+/// builds the URL off the store's *current* `rootURL`, so a board renamed or moved mid-session
+/// writes at the new location (02-architecture.md § Write-failure surfacing).
+///
+/// **Three cases, because the board has exactly three places an identity-bearing folder can be** —
+/// `<root>/<lane>`, `<root>/<lane>/<card>`, and `<root>/.trash/<card>`. The old two-optional-fields
+/// shape could spell a fourth thing that does not exist; this cannot.
+public enum ItemPath: Sendable, Equatable {
+
+    /// A lane: `<root>/<lane>/`.
+    case lane(ItemID)
+
+    /// A card in a lane: `<root>/<lane>/<card>/`.
+    case card(lane: ItemID, id: ItemID)
+
+    /// A card in the board's trash: `<root>/.trash/<card>/`.
+    case trashCard(ItemID)
+
+    /// The item this path names.
+    public var id: ItemID {
+        switch self {
+        case let .lane(id): id
+        case let .card(_, id): id
+        case let .trashCard(id): id
+        }
+    }
+
+    public var isLane: Bool {
+        if case .lane = self { return true }
+        return false
+    }
+
+    /// Which container this path is in — the board for a lane or a lane's card, the trash for a
+    /// trash card. Derived rather than stored: the case *is* the answer.
+    public var container: ItemContainer {
+        if case .trashCard = self { return .trash }
+        return .board
+    }
+
+    /// This path resolved under a board root.
+    public func folder(under root: URL) -> URL {
+        switch self {
+        case let .lane(id):
+            root.appendingPathComponent(id.rawValue, isDirectory: true)
+        case let .card(lane, id):
+            root
+                .appendingPathComponent(lane.rawValue, isDirectory: true)
+                .appendingPathComponent(id.rawValue, isDirectory: true)
+        case let .trashCard(id):
+            BoardWriter.trashFolder(inBoard: root)
+                .appendingPathComponent(id.rawValue, isDirectory: true)
+        }
+    }
+}
+
+extension ItemPath {
+
+    /// The folders `ids` names inside one container, **in display order**.
+    ///
+    /// Display order — lanes left to right, each lane then its cards; the trash top to bottom —
+    /// rather than the caller's set iteration order, which is not an order at all: a batch that
+    /// fails partway must fail the same way twice (`BoardStore.styleSubjects` makes the same choice
+    /// for the same reason).
+    ///
+    /// Ids the container does not hold are simply absent, which is every caller's standing posture:
+    /// a selection the next reload will drop writes nothing rather than being refused.
+    public static func resolve(
+        _ ids: Set<ItemID>,
+        in container: ItemContainer,
+        snapshot: BoardModel
+    ) -> [ItemPath] {
+        guard !ids.isEmpty else { return [] }
+        var result: [ItemPath] = []
+        switch container {
+        case .board:
+            for lane in snapshot.lanes {
+                if ids.contains(lane.id) { result.append(.lane(lane.id)) }
+                for card in lane.cards where ids.contains(card.id) {
+                    result.append(.card(lane: lane.id, id: card.id))
+                }
+            }
+        case .trash:
+            for card in snapshot.trash where ids.contains(card.id) {
+                result.append(.trashCard(card.id))
+            }
+        }
+        return result
+    }
+
+    /// Where one id lives, searching both containers — `nil` when the snapshot does not hold it.
+    ///
+    /// The board is searched first because that is where the overwhelming majority of lookups land;
+    /// an id can only be in one container anyway (board-wide uniqueness spans both —
+    /// 01-storage-format.md § Fractal layout ▸ Rules).
+    public static func of(_ id: ItemID, in snapshot: BoardModel) -> ItemPath? {
+        for lane in snapshot.lanes {
+            if lane.id == id { return .lane(id) }
+            if lane.cards.contains(where: { $0.id == id }) { return .card(lane: lane.id, id: id) }
+        }
+        return snapshot.trash.contains { $0.id == id } ? .trashCard(id) : nil
+    }
+}

Kanban/LiveStore/SearchFilter.swift

@@ -21,7 +21,7 @@ import Foundation
 /// "The filter is the single source of truth for 'what's on the board': layout, drop zones, marquee,
 /// ranges, arrow nav, and lane count badges all read it." They read it *here* — the masonry through
 /// `LaneView.renderedCards`, the ranges and Select All through `SelectionGrammar`'s order lists, the
-/// trash through `TrashLaneView.entries`, and the selection through
+/// trash through `SelectionGrammar.trashCards`, and the selection through
 /// `TransientBoardState.constrainToSearch(in:)`. There is deliberately no second spelling of "does
 /// this card match" anywhere, and no stored result set to go stale (`TransientBoardState`, kind 2).
 ///
@@ -29,9 +29,9 @@ import Foundation
 ///
 /// **Lanes are never hidden by a card query.** 04 filters *cards*; a lane whose cards all miss the
 /// query stays on the board showing an empty body and a `0` badge, because the width division is
-/// layout and the filter is content. `matches(_: Lane)` exists only for the trash, whose rows are
+/// layout and the filter is content. There is no lane overload at all: the tombstone model's trash
-/// tombstoned lanes as often as they are cards and which filter "like any lane" by their own
+/// held lane *entries* that had to be filtered like rows, and lanes are never trashed now
-/// title + body (03-board-ui.md § Trash).
+/// (03-board-ui.md § Trash), so a card predicate is the whole of the filter.
 public struct SearchFilter: Sendable, Equatable {
 
     /// The query exactly as typed — kept so a caller can key a transaction or a test on it.
@@ -78,54 +78,32 @@ public struct SearchFilter: Sendable, Equatable {
         matches(title: card.title.value, body: card.body)
     }
 
-    /// A lane, by its own title and description — the trash's lane entries, and nothing on the board
-    /// itself (see the type's doc comment).
-    public func matches(_ lane: Lane) -> Bool {
-        matches(title: lane.title.value, body: lane.body)
-    }
-
-    /// A trash row, **by its own title and body**, whichever kind it is: "shown, it participates in
-    /// the filter like any lane" (03-board-ui.md § Trash), and a lane entry is a row like a card row.
-    ///
-    /// A lane entry is deliberately *not* matched through its cards: the entry is one restorable
-    /// thing, and a lane surfacing because a card buried inside it matched would be a row the user
-    /// cannot act on the way the match suggests.
-    public func matches(_ entry: TrashEntry) -> Bool {
-        switch entry {
-        case let .card(card, _): matches(card)
-        case let .lane(lane, _): matches(lane)
-        }
-    }
-
     // MARK: - The visible universe
 
-    /// Every id the filter leaves visible on `side` — **the universe
+    /// Every id the filter leaves visible in `container` — **the universe
     /// `ItemReferenceSet.constrained(to:)` is handed** for 04's "hidden cards leave the selection"
     /// (`TransientBoardState.constrainToSearch(in:)`).
     ///
-    /// It is shaped exactly like `ItemReferenceSet.idUniverse(of:on:)` and means the same thing one
+    /// It is shaped exactly like `ItemContainer.ids(in:)` and means the same thing one step
-    /// step narrower: that one answers "what does the board *have*", this one "what does the board
+    /// narrower: that one answers "what does the board *have*", this one "what does the board
-    /// *show*". Two differences, both stated above and neither incidental:
+    /// *show*". The one difference is stated above and is not incidental: **every lane is in it**,
-    ///
+    /// because the filter hides cards, so a lane selection survives a query that empties its body.
-    /// - **Live lanes are all in it.** The filter hides cards, so a lane is visible whatever its
+    public func visibleIDs(in snapshot: BoardModel, container: ItemContainer) -> Set<ItemID> {
-    ///   cards do — a lane selection survives a query that empties its body.
-    /// - **The trashed side is the trash's rows**, filtered — `TrashModel.entries`' absolute
-    ///   ancestor walk, which already excludes the cards a tombstoned lane subsumes. Those have no
-    ///   row, so they are visible to nobody and belong in no universe a selection is held to.
-    public func visibleIDs(in snapshot: BoardModel, on side: Liveness) -> Set<ItemID> {
-        switch side {
-        case .live:
         var ids: Set<ItemID> = []
-            for lane in snapshot.lanes where !lane.isDeleted {
+        switch container {
+        case .board:
+            for lane in snapshot.lanes {
                 ids.insert(lane.id)
-                for card in lane.cards where !card.isDeleted && matches(card) {
+                for card in lane.cards where matches(card) {
+                    ids.insert(card.id)
+                }
+            }
+        case .trash:
+            for card in snapshot.trash where matches(card) {
                 ids.insert(card.id)
             }
         }
         return ids
-        case .trashed:
-            return Set(TrashModel.entries(of: snapshot).lazy.filter { matches($0) }.map(\.id))
-        }
     }
 
     // MARK: - Folding

Kanban/LiveStore/SelectionGrammar.swift

@@ -21,22 +21,22 @@ public enum SelectionKind: String, Codable, Sendable, Equatable {
     case lane
 }
 
-/// What a pointer click names: an item, its level, and the side of the live/trash boundary the
+/// What a pointer click names: an item, its level, and the container the surface it was clicked on
-/// surface it was clicked on sits on.
+/// belongs to.
 ///
-/// The **side is the surface's, not the item's** — a card face is always `.live` and a trash row is
+/// The **container is the surface's, not the item's** — a card face is always `.board` and a trash
-/// always `.trashed`, because that is what the user clicked. A click on a surface whose item flipped
+/// row is always `.trash`, because that is what the user clicked. A click on a surface whose item
-/// liveness a moment ago simply selects nothing the next reload will keep, which is the ordinary
+/// crossed containers a moment ago simply selects nothing the next reload will keep, which is the
-/// vanish rule and not a case for this type to model.
+/// ordinary vanish rule and not a case for this type to model.
 public struct SelectionTarget: Sendable, Equatable {
     public var id: ItemID
     public var kind: SelectionKind
-    public var side: Liveness
+    public var container: ItemContainer
 
-    public init(id: ItemID, kind: SelectionKind, side: Liveness) {
+    public init(id: ItemID, kind: SelectionKind, container: ItemContainer) {
         self.id = id
         self.kind = kind
-        self.side = side
+        self.container = container
     }
 }
 
@@ -59,15 +59,16 @@ public enum ClickModifier: Sendable, Equatable {
 /// (`SelectionGrammarTests`).
 ///
 /// **Homogeneity is the invariant, and it is enforced here or nowhere.** The selection is
-/// homogeneous on three axes at once — cards XOR lanes (§ Selection), live XOR tombstoned, and
+/// homogeneous on **two** axes now — cards XOR lanes (§ Selection) and board XOR trash (§ The
-/// within the trash card entries XOR lane entries (§ The trash) — and every one of them is a
+/// trash's "single container rule replacing the old liveness law") — and the third, kind-inside-the
-/// property of what a *click* is allowed to produce. So no outcome below is ever mixed: a modifier
+/// -trash, retired with the lane entries it separated: "Cards only. Lanes are never trashed".
-/// that would cross an axis degrades to a replace, which is the only answer that keeps the
+/// Both surviving axes are a property of what a *click* is allowed to produce, so no outcome below
-/// invariant true without silently dropping what the user asked for.
+/// is ever mixed: a modifier that would cross an axis degrades to a replace, which is the only
+/// answer that keeps the invariant true without silently dropping what the user asked for.
 ///
 /// **Pure, for `NewCardTarget`'s reason**: the branches become lines of test rather than gestures to
 /// drive, and the four surfaces that clicks arrive on (card face, lane header, lane empty space,
-/// trash row) share one answer instead of four near-copies of it.
+/// trash card) share one answer instead of four near-copies of it.
 public enum SelectionGrammar {
 
     /// What a click leaves behind: the new selection, the anchor a subsequent ⇧-click would range
@@ -100,7 +101,7 @@ public enum SelectionGrammar {
     /// The grammar, one call.
     ///
     /// - Parameters:
-    ///   - target: what was clicked, with the surface's liveness side (see `SelectionTarget`).
+    ///   - target: what was clicked, with the surface's container (see `SelectionTarget`).
     ///   - modifier: the effective modifier, already reduced to one of three (`ClickModifier`).
     ///   - selection: the board's current selection.
     ///   - anchor: the range origin — `TransientBoardState.selectionAnchor`.
@@ -145,18 +146,18 @@ public enum SelectionGrammar {
         selection: ItemReferenceSet,
         togglesOnRepeat: Bool
     ) -> Outcome {
-        if togglesOnRepeat, selection.liveness == target.side, selection.ids == [target.id] {
+        if togglesOnRepeat, selection.container == target.container, selection.ids == [target.id] {
             return .cleared
         }
         return Outcome(
-            selection: ItemReferenceSet(ids: [target.id], liveness: target.side),
+            selection: ItemReferenceSet(ids: [target.id], container: target.container),
             anchor: target.id,
             head: target.id
         )
     }
 
     /// **⌘-click toggles** — but only *within* a homogeneous set. Crossing either axis (a card
-    /// clicked while lanes are selected, a trash row clicked while live cards are) is not a mixed
+    /// clicked while lanes are selected, a trash card clicked while board cards are) is not a mixed
     /// selection and not a refusal: it is a **replace**, the same outcome a plain click would give,
     /// because the click unambiguously names a new set of one.
     ///
@@ -168,7 +169,7 @@ public enum SelectionGrammar {
         selection: ItemReferenceSet,
         snapshot: BoardModel
     ) -> Outcome {
-        guard selection.liveness == target.side,
+        guard selection.container == target.container,
               let current = kind(of: selection, in: snapshot),
               current == target.kind
         else {
@@ -183,7 +184,7 @@ public enum SelectionGrammar {
             return .cleared
         }
         return Outcome(
-            selection: ItemReferenceSet(ids: ids, liveness: target.side),
+            selection: ItemReferenceSet(ids: ids, container: target.container),
             anchor: target.id,
             head: target.id
         )
@@ -195,7 +196,7 @@ public enum SelectionGrammar {
     ///
     /// The anchor is valid **iff both it and the target sit in the same order list** — which folds
     /// the nil anchor, the vanished anchor, and every axis crossing into one test, since a list is
-    /// exactly one (side, kind) pair. An invalid anchor makes the click a plain one, never a no-op:
+    /// exactly one (container, kind) pair. An invalid anchor makes the click a plain one, never a no-op:
     /// the keyboard's ⇧-arrow goes inert at a boundary because its next step is ambiguous, while a
     /// click names an unambiguous target and so always has something to do.
     private static func shift(
@@ -210,15 +211,15 @@ public enum SelectionGrammar {
                   from: anchor,
                   to: target.id,
                   kind: target.kind,
-                  on: target.side,
+                  in: target.container,
-                  in: snapshot,
+                  snapshot: snapshot,
                   filter: filter
               )
         else {
             return plain(target, selection: selection, togglesOnRepeat: false)
         }
         return Outcome(
-            selection: ItemReferenceSet(ids: span, liveness: target.side),
+            selection: ItemReferenceSet(ids: span, container: target.container),
             anchor: anchor,
             head: target.id
         )
@@ -234,8 +235,8 @@ public enum SelectionGrammar {
     ///
     /// **`nil` means the two do not share a list**, which folds the vanished endpoint, the nil
     /// anchor's caller-side absence, and every axis crossing into one test — a list is exactly one
-    /// (side, kind) pair. The callers differ on what they do with that: a click degrades to a plain
+    /// (container, kind) pair. The callers differ on what they do with that: a click degrades to a
-    /// click (it names an unambiguous target), while a ⇧-arrow goes inert (its next step is
+    /// plain click (it names an unambiguous target), while a ⇧-arrow goes inert (its next step is
     /// ambiguous).
     ///
     /// **A filtered endpoint is a missing one**, which needs no rule of its own: a card the search
@@ -246,44 +247,47 @@ public enum SelectionGrammar {
         from: ItemID,
         to: ItemID,
         kind: SelectionKind,
-        on side: Liveness,
+        in container: ItemContainer,
-        in snapshot: BoardModel,
+        snapshot: BoardModel,
         filter: SearchFilter = .inactive
     ) -> Set<ItemID>? {
-        let list = order(of: kind, on: side, in: snapshot, filter: filter)
+        let list = order(of: kind, in: container, snapshot: snapshot, filter: filter)
         guard let start = list.firstIndex(of: from), let end = list.firstIndex(of: to) else { return nil }
         return Set(start <= end ? list[start...end] : list[end...start])
     }
 
     // MARK: - The order lists
 
-    /// The list a ⇧-range walks for one (side, kind) pair — **the single place a "what's on the
+    /// The list a ⇧-range walks for one (container, kind) pair — **the single place a "what's on the
     /// board, in what order" question is answered** for the pointer.
     ///
     /// **The search filter threads in here and in `MarqueeTargetRegistry`'s membership, and nowhere
     /// else** — the filter "is the single source of truth for what's on the board … ranges … all
     /// read it" (04-interactions.md § Search), and every range, every Select All and every arrow
-    /// walk is stated in terms of these four lists, so one parameter narrows all of them together.
+    /// walk is stated in terms of these lists, so one parameter narrows all of them together.
     ///
     /// It defaults to `.inactive` so the many callers with no query in hand (the drag's flatten
     /// order, a lane-index lookup, the successor's container) read exactly as they did before the
     /// filter existed; the callers that *are* the board's input grammar pass the store's query.
     ///
     /// **The lane list takes no filter**, because a card query hides no lane — see `SearchFilter`.
+    /// **`(.trash, .lane)` is empty by construction**: "Cards only. Lanes are never trashed"
+    /// (03-board-ui.md § Trash), so there is no such list to walk rather than a rule saying not to.
     public static func order(
         of kind: SelectionKind,
-        on side: Liveness,
+        in container: ItemContainer,
-        in snapshot: BoardModel,
+        snapshot: BoardModel,
         filter: SearchFilter = .inactive
     ) -> [ItemID] {
-        switch (side, kind) {
+        switch (container, kind) {
-        case (.live, .card): liveCards(in: snapshot, filter: filter)
+        case (.board, .card): boardCards(in: snapshot, filter: filter)
-        case (.live, .lane): liveLanes(in: snapshot)
+        case (.board, .lane): lanes(in: snapshot)
-        case (.trashed, _): trashEntries(of: kind, in: snapshot, filter: filter)
+        case (.trash, .card): trashCards(in: snapshot, filter: filter)
+        case (.trash, .lane): []
         }
     }
 
-    /// Live cards in **flatten order** — "lane `order` first, then card `order` (a cross-lane
+    /// The board's cards in **flatten order** — "lane `order` first, then card `order` (a cross-lane
     /// selection flattens left-to-right, top-to-bottom)", the multi-drag order the ⌘N target rule
     /// and paste anchoring already share (04-interactions.md ▸ Drag and drop, ▸ The map).
     ///
@@ -293,85 +297,65 @@ public enum SelectionGrammar {
     /// **The filter narrows the walk in place**, which is what makes a search-time ⇧-range and
     /// Select All read the same board the masonry drew: `LaneView.renderedCards` applies the same
     /// predicate to the same cards, one lane at a time, and this is that collection flattened.
-    public static func liveCards(in snapshot: BoardModel, filter: SearchFilter = .inactive) -> [ItemID] {
+    public static func boardCards(in snapshot: BoardModel, filter: SearchFilter = .inactive) -> [ItemID] {
         var ids: [ItemID] = []
-        for lane in snapshot.lanes where !lane.isDeleted {
+        for lane in snapshot.lanes {
-            for card in lane.cards where !card.isDeleted && filter.matches(card) {
+            for card in lane.cards where filter.matches(card) {
                 ids.append(card.id)
             }
         }
         return ids
     }
 
-    /// Live lanes, left to right. Tombstoned lanes render nowhere on the board (03-board-ui.md §
+    /// The board's lanes, left to right.
-    /// Trash collapses each into one entry), so they are absent from the live lane order entirely.
     ///
     /// **No search filter, deliberately**: 04 § Search filters *cards*, and a lane whose body the
     /// query empties is still a lane on the board — the width division is layout, and the badge
     /// showing `0` is the honest report. So the lane domain's ranges, arrows and moves are the one
     /// part of the board grammar a search does not narrow.
-    public static func liveLanes(in snapshot: BoardModel) -> [ItemID] {
+    public static func lanes(in snapshot: BoardModel) -> [ItemID] {
-        snapshot.lanes.filter { !$0.isDeleted }.map(\.id)
+        snapshot.lanes.map(\.id)
     }
 
-    /// One kind of trash row, in the quasi-lane's own deterministic order (`TrashModel.entries`,
+    /// The trash's cards, top to bottom — `snapshot.trash` itself, which the loader already sorted
-    /// whose sort is "load-bearing for input — arrow walks, ⇧-ranges, and the rubber band all read
+    /// by `order` like any lane's children (03-board-ui.md § Trash: "the trash sorts by `order` like
-    /// it").
+    /// any lane", newest-first falling out of the ranks rather than a timestamp sort).
     ///
-    /// **Filtered to one kind, so a range skips what it cannot include.** Card and lane entries
+    /// **Filtered like any lane** (03-board-ui.md § Trash: "shown, its cards participate in the
-    /// interleave in one ordering, and "a selection never mixes card entries and lane entries"
+    /// filter exactly like any other card") — the same predicate `TrashLaneView` applies to the same
-    /// (04-interactions.md ▸ The trash), so a ⇧-range between two card rows spans the sorted order
+    /// cards, so a trash-side range walks exactly what the column is showing.
-    /// and collects only the card rows — stepping over any lane row that sits between them. That is
+    public static func trashCards(in snapshot: BoardModel, filter: SearchFilter = .inactive) -> [ItemID] {
-    /// the deliberate pointer twin of the keyboard's rule: a ⇧-arrow onto a lane entry is *inert*
+        snapshot.trash.filter { filter.matches($0) }.map(\.id)
-    /// because its next step is ambiguous, while a click names an unambiguous same-kind target and
-    /// so the range simply skips.
-    ///
-    /// **Filtered like any lane** (03-board-ui.md § Trash) — the same predicate `TrashLaneView`
-    /// applies to the same rows, so a trash-side range walks exactly what the column is showing.
-    public static func trashEntries(
-        of kind: SelectionKind,
-        in snapshot: BoardModel,
-        filter: SearchFilter = .inactive
-    ) -> [ItemID] {
-        TrashModel.entries(of: snapshot)
-            .filter { $0.isLaneEntry == (kind == .lane) && filter.matches($0) }
-            .map(\.id)
     }
 
     // MARK: - The current selection's kind
 
-    /// Which level the selection holds, or `nil` when it holds nothing the board renders on its own
+    /// Which level the selection holds, or `nil` when it holds nothing its container renders.
-    /// side.
     ///
     /// **Any member answers, because the set is homogeneous** — but the walk is the snapshot's order
     /// rather than the set's iteration order, so the answer is deterministic even for a set that
     /// somehow was not. Members that name nothing are ignored, and a set of only such members reads
     /// as empty: a selection the next reload will drop must not decide what a click does now.
     ///
-    /// The membership rules are exactly the order lists': on the live side an item counts when its
+    /// **The trash answers `.card` or nothing**, because lanes are never trashed — which is why the
-    /// effective liveness is live, and on the trashed side only **rows** count — a card under a
+    /// trash's old kind axis (card entries XOR lane entries) has no code left anywhere.
-    /// tombstoned lane has no row of its own (`TrashModel.entries`' absolute ancestor walk), so it
-    /// is nobody's kind.
     public static func kind(of selection: ItemReferenceSet, in snapshot: BoardModel) -> SelectionKind? {
         guard !selection.isEmpty else { return nil }
+        switch selection.container {
+        case .trash:
+            return snapshot.trash.contains { selection.ids.contains($0.id) } ? .card : nil
+        case .board:
             for lane in snapshot.lanes {
-            if Liveness(isDeleted: lane.isDeleted) == selection.liveness, selection.ids.contains(lane.id) {
+                if selection.ids.contains(lane.id) { return .lane }
-                return .lane
+                if lane.cards.contains(where: { selection.ids.contains($0.id) }) { return .card }
-            }
-            // A tombstoned lane subsumes its subtree on both sides: its cards render nowhere live
-            // and have no trash row of their own.
-            guard !lane.isDeleted else { continue }
-            for card in lane.cards
-            where Liveness(isDeleted: card.isDeleted) == selection.liveness && selection.ids.contains(card.id) {
-                return .card
-            }
             }
             return nil
         }
+    }
 
     // MARK: - Successor on delete
 
-    /// What ⌫ selects after tombstoning `ids` — 04-interactions.md ▸ The map's Finder-style
+    /// What ⌫ selects after deleting `ids` — 04-interactions.md ▸ The map's Finder-style
     /// successor sibling, as a pure function of the **pre-write** snapshot.
     ///
     /// > Selection moves to the deleted item's successor sibling, Finder-style (next card in the
@@ -389,49 +373,56 @@ public enum SelectionGrammar {
     /// - **`nil` is a legitimate answer** — an emptied container selects nothing, and the caller
     ///   clears.
     ///
+    /// **Both stagings of Delete get one** (04, resettled 2026-07-28 — "one Delete vocabulary,
+    /// staged by place"): `container` says which side the gesture ran on, and the trash walks its own
+    /// ordered cards exactly as a lane walks its own. The permanent delete is as deliberate an act as
+    /// the move-to-trash, so it keeps the repeatable-keystroke property the rule exists for.
+    ///
     /// **Deliberate deletes only.** External vanishing never picks a successor (02-architecture.md's
     /// reload-survival rule: "the selection just shrinks"), which is why this is called by
-    /// `BoardStore.delete` and by nothing on the reload path.
+    /// `BoardStore`'s delete paths and by nothing on the reload path.
     ///
-    /// **The container is what the lane is *showing*.** Under a search the successor must be a card
+    /// **The container is what the surface is *showing*.** Under a search the successor must be a
-    /// the user can see — "nothing invisible stays selected" is the trash's phrasing of a rule the
+    /// card the user can see — picking a hidden neighbour would hand the selection straight back to
-    /// filter obeys too — and picking a hidden neighbour would hand the selection straight back to
     /// `constrainToSearch(in:)` to drop, which is a deselect wearing a successor's clothes. So the
     /// filter narrows the container, and repeated ⌫ walks down the *filtered* lane.
     public static func successor(
         afterDeleting ids: Set<ItemID>,
-        in snapshot: BoardModel,
+        in container: ItemContainer = .board,
+        snapshot: BoardModel,
         filter: SearchFilter = .inactive
     ) -> ItemID? {
         guard !ids.isEmpty else { return nil }
-        let selection = ItemReferenceSet(ids: ids, liveness: .live)
+        let selection = ItemReferenceSet(ids: ids, container: container)
         guard let kind = kind(of: selection, in: snapshot) else { return nil }
 
-        let container: [ItemID]
+        let siblings: [ItemID]
-        switch kind {
+        switch (container, kind) {
-        case .lane:
+        case (.trash, _):
-            container = liveLanes(in: snapshot)
+            siblings = trashCards(in: snapshot, filter: filter)
-        case .card:
+        case (.board, .lane):
+            siblings = lanes(in: snapshot)
+        case (.board, .card):
             // The last selected card in flatten order names the lane; its lane's rendered cards are
             // the container the successor is drawn from.
-            guard let last = liveCards(in: snapshot, filter: filter).last(where: { ids.contains($0) }),
+            guard let last = boardCards(in: snapshot, filter: filter).last(where: { ids.contains($0) }),
                   let lane = snapshot.lanes.first(where: { lane in
-                      !lane.isDeleted && lane.cards.contains { $0.id == last && !$0.isDeleted }
+                      lane.cards.contains { $0.id == last }
                   })
             else { return nil }
-            container = lane.cards.filter { !$0.isDeleted && filter.matches($0) }.map(\.id)
+            siblings = lane.cards.filter { filter.matches($0) }.map(\.id)
         }
 
-        let doomed = container.indices.filter { ids.contains(container[$0]) }
+        let doomed = siblings.indices.filter { ids.contains(siblings[$0]) }
         guard let first = doomed.first, let last = doomed.last else { return nil }
-        if let after = container[(last + 1)...].first(where: { !ids.contains($0) }) { return after }
+        if let after = siblings[(last + 1)...].first(where: { !ids.contains($0) }) { return after }
-        return container[..<first].last { !ids.contains($0) }
+        return siblings[..<first].last { !ids.contains($0) }
     }
 }
 
 // MARK: - The rubber band
 
-/// One item the marquee can sweep: its identity, its level, its side, and where it is drawn.
+/// One item the marquee can sweep: its identity, its level, its container, and where it is drawn.
 ///
 /// The frame is in the board strip's coordinate space (`BoardView.stripSpace`) and is **registered
 /// by the view that draws it** (`MarqueeTargetRegistry`) rather than computed here: the masonry's
@@ -439,57 +430,54 @@ public enum SelectionGrammar {
 public struct MarqueeTarget: Sendable, Equatable {
     public var id: ItemID
     public var kind: SelectionKind
-    public var side: Liveness
+    public var container: ItemContainer
     public var frame: CGRect
 
-    public init(id: ItemID, kind: SelectionKind, side: Liveness, frame: CGRect) {
+    public init(id: ItemID, kind: SelectionKind, container: ItemContainer, frame: CGRect) {
         self.id = id
         self.kind = kind
-        self.side = side
+        self.container = container
         self.frame = frame
     }
 }
 
-/// What a rubber band selects, as a pure function of the band, the drawn frames, and the side the
+/// What a rubber band selects, as a pure function of the band, the drawn frames, and the container
-/// band started on (`SelectionGrammarTests`).
+/// the band started in (`SelectionGrammarTests`).
 ///
 /// The two rules it exists to state, both 04-interactions.md's:
 ///
-/// - **The band stays on the side of the boundary it started on** (▸ The trash), which is why `side`
+/// - **The band stays on the side of the boundary it started on** (▸ The trash), which is why
-///   is a parameter rather than something derived from what the rect happens to touch: a band begun
+///   `container` is a parameter rather than something derived from what the rect happens to touch: a
-///   on the board and dragged over the trash column selects live cards and nothing else.
+///   band begun on the board and dragged over the trash column selects board cards and nothing else.
 /// - **The band never selects lanes** (§ Selection gives it to cards: "click-drag rubber-bands
 ///   across lanes" — across them, not over them). Lanes are simply never registered as targets, and
-///   the live branch filters to cards anyway so the rule holds even if one were.
+///   the filter below keeps the rule true even if one were.
+///
+/// **There is no kind rule any more.** Under the tombstone model the trash interleaved card rows and
+/// lane rows in one column, so the band needed a topmost-wins tie-break to stay homogeneous by kind;
+/// lanes are never trashed now, so both containers hold cards and the rule is one line for both.
 public enum MarqueeMath {
 
     /// The ids `rect` sweeps.
-    ///
+    public static func selection(
-    /// On the **trashed** side the band must additionally stay homogeneous by *kind*, because the
+        rect: CGRect,
-    /// trash's two row kinds interleave in one column. The rule is topmost-wins: the kind of the
+        targets: [MarqueeTarget],
-    /// highest intersecting row decides, and rows of the other kind are dropped — so a band pulled
+        in container: ItemContainer
-    /// down from a card row keeps collecting card rows and steps over the lane rows between them,
+    ) -> Set<ItemID> {
-    /// exactly as a ⇧-range does.
+        Set(
-    public static func selection(rect: CGRect, targets: [MarqueeTarget], side: Liveness) -> Set<ItemID> {
+            targets.lazy
-        let hits = targets.filter { $0.side == side && rect.intersects($0.frame) }
+                .filter { $0.container == container && $0.kind == .card && rect.intersects($0.frame) }
-        guard !hits.isEmpty else { return [] }
+                .map(\.id)
-
+        )
-        switch side {
-        case .live:
-            return Set(hits.lazy.filter { $0.kind == .card }.map(\.id))
-        case .trashed:
-            guard let topmost = hits.min(by: isAbove) else { return [] }
-            return Set(hits.lazy.filter { $0.kind == topmost.kind }.map(\.id))
-        }
     }
 
     /// Which of two drawn rows is "higher" — top edge, then leading edge, then identity.
     ///
     /// Total rather than merely correct-for-a-column: two rows sharing a top edge must still order
-    /// the same way twice, or the topmost-kind rule would pick differently on identical input.
+    /// the same way twice.
     ///
-    /// Shared with `NavigationMath`, which breaks its score ties with it for the same reason: two
+    /// Used by `NavigationMath`, which breaks its score ties with it: two candidates that a metric
-    /// candidates that a metric cannot separate must still be separated the same way twice.
+    /// cannot separate must still be separated the same way twice.
     static func isAbove(_ lhs: MarqueeTarget, _ rhs: MarqueeTarget) -> Bool {
         if lhs.frame.minY != rhs.frame.minY { return lhs.frame.minY < rhs.frame.minY }
         if lhs.frame.minX != rhs.frame.minX { return lhs.frame.minX < rhs.frame.minX }

Kanban/LiveStore/StyleModel.swift

@@ -154,7 +154,7 @@ public struct StyleEditorSession: Sendable, Equatable {
         case .board:
             return self
         case let .items(ids):
-            let live = ItemReferenceSet(ids: ids, liveness: .live).resolved(against: snapshot).ids
+            let live = ItemReferenceSet(ids: ids, container: .board).resolved(against: snapshot).ids
             guard !live.isEmpty else { return nil }
             return live == ids ? self : StyleEditorSession(target: .items(live))
         }
@@ -170,9 +170,9 @@ public struct StyleEditorSession: Sendable, Equatable {
     /// the popover lands on the first thing the user's eye would find.
     public func presentationAnchor(in snapshot: BoardModel) -> ItemID? {
         guard case let .items(ids) = target else { return nil }
-        for lane in snapshot.lanes where !lane.isDeleted {
+        for lane in snapshot.lanes {
             if ids.contains(lane.id) { return lane.id }
-            if let card = lane.cards.first(where: { !$0.isDeleted && ids.contains($0.id) }) { return card.id }
+            if let card = lane.cards.first(where: { ids.contains($0.id) }) { return card.id }
         }
         return nil
     }

Kanban/LiveStore/TransientBoardState.swift

@@ -1,82 +1,9 @@
 import Foundation
 import Observation
 
-// MARK: - Liveness
-
-/// Which side of the live/tombstoned boundary something sits on.
-///
-/// An item-referencing set is **homogeneous by liveness** (04-interactions.md § The trash): it never
-/// mixes live and tombstoned items, so the side is a property of the set as a whole rather than of
-/// each member — which is exactly what makes re-resolution across a reload a matching rule rather
-/// than a partition.
-///
-/// **`String`-backed and `Codable` because the clipboard manifest carries one** (04-interactions.md
-/// ▸ Clipboard: a manifest records its entries' "source side (live/trashed)"). The raw spellings are
-/// therefore pasteboard API — a manifest written before a quit is decoded after the relaunch — and
-/// they are the case names so nothing has to remember a second vocabulary.
-public enum Liveness: String, Codable, Sendable, Equatable {
-    case live
-    case trashed
-
-    /// The side an item's own tombstone flag puts it on. `Lane.isDeleted`/`Card.isDeleted` are
-    /// presence-of-the-key, not validity, so a malformed `deleted:` still reads as trashed — see
-    /// their doc comments in `BoardModel.swift`.
-    init(isDeleted: Bool) {
-        self = isDeleted ? .trashed : .live
-    }
-}
-
-// MARK: - The one definition of a side
-
-extension Liveness {
-
-    /// Every item `snapshot` has on this side, visited in **board order** — lanes left to right,
-    /// each lane immediately before its own cards — as the lane it lives under and, for a card, the
-    /// card itself.
-    ///
-    /// **This is the definition, and it is the only one** (02-architecture.md § Changes from Kanban,
-    /// settled: "universe and rows are one function, never a broader set with a pointer-side
-    /// subset"). Everything that asks what is on a side is this walk with a different accumulator:
-    /// `ItemReferenceSet.idUniverse` collects ids, `TrashModel.entries` builds the trash's rows,
-    /// `TrashModel.paths` and `emptyTrashTargets` build folders. Two spellings of the rule would be
-    /// two things to keep in step, and the one they would eventually disagree about is precisely the
-    /// item below.
-    ///
-    /// **The whole rule is the `continue`: a tombstoned lane subsumes its subtree.** It contributes
-    /// one item to the trashed side — its own row — and its cards contribute nothing to *either*
-    /// side, whatever their own flags say. That is 03-board-ui.md § Trash's absolute ancestor walk
-    /// stated as code: "a card that carries its own `deleted:` under a tombstoned lane has **no row
-    /// of its own**".
-    ///
-    /// **So the two sides do not partition the board, and that is the point.** A card beneath a
-    /// tombstoned lane is in *neither* universe, because it renders nowhere — no row, no membership.
-    /// A selection, a drag, a pending cut, a range anchor or a navigation head can therefore never
-    /// survive a reload sitting on something no surface would draw, and 04-interactions.md § Search's
-    /// hidden-cards-leave-the-selection rule and 02's reload-survival rule stay one rule rather than
-    /// two that happen to agree.
-    ///
-    /// Non-escaping and accumulator-driven rather than array-returning: the callers below run on
-    /// every reload and on every menu validation, and none of them wants a board-sized copy of the
-    /// model to throw away.
-    func walk(_ snapshot: BoardModel, visiting visit: (Lane, Card?) -> Void) {
-        for lane in snapshot.lanes {
-            if lane.isDeleted {
-                // The subsumption, both halves of it: the lane is a trash row, and its cards are
-                // nobody's — so the loop below never runs for them.
-                if self == .trashed { visit(lane, nil) }
-                continue
-            }
-            if self == .live { visit(lane, nil) }
-            for card in lane.cards where Liveness(isDeleted: card.isDeleted) == self {
-                visit(lane, card)
-            }
-        }
-    }
-}
-
 // MARK: - ItemReferenceSet
 
-/// A set of UUIDs over the snapshot plus the liveness side it lives on — **the one shape every
+/// A set of UUIDs over the snapshot plus the container it lives in — **the one shape every
 /// piece of transient state that points at items wears**: the selection, drag membership, and the
 /// pending cut are three values of this type, not three hand-rolled near-copies
 /// (02-architecture.md § Live-reload resilience, "Selection — and every transient state that
@@ -92,46 +19,52 @@ extension Liveness {
 /// and everything else here is that primitive with a universe supplied. Only the universe differs
 /// between the two callers:
 ///
-/// - **Reload survival**: the universe is the new snapshot's ids on this set's liveness side, which
+/// - **Reload survival**: the universe is the new snapshot's ids in this set's container, which
 ///   is what `resolved(against:)` computes before delegating.
 /// - **The live search filter**: the universe is the visible ids the predicate produced, so
 ///   04-interactions.md § Search's "hidden cards leave the selection" needs no second rule — it is
-///   this one, with a different universe (m5 wires that caller).
+///   this one, with a different universe.
 ///
 /// Both stay **pure value functions**. Deciding *when* to apply them belongs to the caller, and
 /// storing the result belongs to `TransientBoardState` — a set that filtered itself would need to
 /// know about snapshots, and the whole point of the value-type snapshot is that nothing has to.
 public struct ItemReferenceSet: Sendable, Equatable {
     public var ids: Set<ItemID>
-    public var liveness: Liveness
 
-    public init(ids: Set<ItemID> = [], liveness: Liveness = .live) {
+    /// Which container the members live in — the board, or `.trash/` (`ItemContainer`).
+    ///
+    /// A property of the set as a whole rather than of each member, because 04-interactions.md ▸ The
+    /// trash keeps exactly one boundary: "a selection never mixes trash cards with board cards".
+    /// That is what makes re-resolution across a reload a matching rule rather than a partition.
+    public var container: ItemContainer
+
+    public init(ids: Set<ItemID> = [], container: ItemContainer = .board) {
         self.ids = ids
-        self.liveness = liveness
+        self.container = container
     }
 
-    /// Nothing referenced, on the live side — the state a board opens in, the state a drag with
+    /// Nothing referenced, on the board side — the state a board opens in, the state a drag with
     /// nothing in flight is in, and the state `TransientBoardState.clearSelection()` returns to.
     public static let empty = ItemReferenceSet()
 
     public var isEmpty: Bool { ids.isEmpty }
 
-    /// This set narrowed to `universe`: members that are in it, **side unchanged**.
+    /// This set narrowed to `universe`: members that are in it, **container unchanged**.
     ///
     /// The primitive both directions are built from — intersection and nothing else. It is
-    /// deliberately ignorant of what a universe *is*: a snapshot's ids on one liveness side
+    /// deliberately ignorant of what a universe *is*: a snapshot's ids in one container
     /// (`resolved(against:)`) and a search predicate's visible ids are the same argument as far as
     /// the rule is concerned, which is what lets one rule be stated once and mean both.
     ///
-    /// The liveness side survives even when the membership does not: an emptied set is still a set
+    /// The container survives even when the membership does not: an emptied set is still a set in a
-    /// on a side, and re-populating it (a fresh click, a new drag) is the caller's business.
+    /// container, and re-populating it (a fresh click, a new drag) is the caller's business.
     public func constrained(to universe: Set<ItemID>) -> ItemReferenceSet {
         guard !ids.isEmpty else { return self }
-        return ItemReferenceSet(ids: ids.intersection(universe), liveness: liveness)
+        return ItemReferenceSet(ids: ids.intersection(universe), container: container)
     }
 
-    /// This set re-grounded on `snapshot`: the members that are still there, **on the same liveness
+    /// This set re-grounded on `snapshot`: the members that are still there, **in the same
-    /// side**, and nothing else.
+    /// container**, and nothing else.
     ///
     /// Two rules, both settled in 02-architecture.md § Live-reload resilience:
     ///
@@ -139,35 +72,19 @@ public struct ItemReferenceSet: Sendable, Equatable {
     ///   an empty result is a legitimate outcome. (App-mediated deletion is deliberately different:
     ///   ⌫ selects the successor sibling, because that is an act rather than a surprise —
     ///   04-interactions.md ▸ The map. That belongs to the delete command, not here.)
-    /// - **A liveness flip is a vanish.** A foreign edit that tombstones a selected live card — or
+    /// - **A container crossing is a vanish** (resettled 2026-07-28, the materialized trash): "a
-    ///   restores a selected tombstoned one — ejects it, keeping 04-interactions.md's
+    ///   foreign move that trashes a selected board card — or restores a selected trash card —
-    ///   homogeneous-by-liveness invariant true across reloads so menu validation never sees a
+    ///   ejects it from the selection (and from the pending cut)", keeping 04's container-boundary
-    ///   mixed selection. The pending cut inherits the same rule for free (04 ▸ Clipboard: "a cut
+    ///   invariant true across reloads so menu validation never sees a mixed selection. Drag
-    ///   item that is tombstoned or vanishes externally before paste drops out of the pending
+    ///   membership inherits it for free (04 ▸ Drag and drop's emptied-drag rule).
-    ///   cut"), and so does drag membership (04 ▸ Drag and drop's emptied-drag rule).
     ///
-    /// The liveness that is matched is **effective — ancestor-walked** (settled), and the trashed
+    /// **Presence is the whole test.** There is no ancestor walk and no effective liveness left to
-    /// side is exactly the trash's rows: `Liveness.walk` is the one definition both sides read.
+    /// compute — "the old effective-liveness ancestor walk is retired with the tombstone model"
-    /// Tombstoning a lane therefore ejects its cards from a live set even though their own flags
+    /// (02-architecture.md) — because a deleted card's folder has actually moved, and a folder is
-    /// never changed — and does **not** hand them to a trashed set, because the lane's single entry
+    /// either in the container or it is not.
-    /// subsumes them (03-board-ui.md). A card under a tombstoned lane renders nowhere on either
-    /// side, and nothing invisible may stay selected, drag-included, or pending-cut.
     public func resolved(against snapshot: BoardModel) -> ItemReferenceSet {
         guard !ids.isEmpty else { return self }
-        return constrained(to: Self.idUniverse(of: snapshot, on: liveness))
+        return constrained(to: container.ids(in: snapshot))
-    }
-
-    /// Every id in `snapshot` on `side` — the reload direction's universe.
-    ///
-    /// One line over `Liveness.walk`, which is where the rule itself lives and is stated: the live
-    /// side is the live lanes and their unflagged cards, and the trashed side is *exactly* the trash's
-    /// rows — tombstoned lanes, plus cards carrying their own `deleted:` under a live lane. Nothing
-    /// else is in either, so a card hidden beneath a tombstoned lane belongs to no universe and no
-    /// set may go on referencing it.
-    static func idUniverse(of snapshot: BoardModel, on side: Liveness) -> Set<ItemID> {
-        var universe: Set<ItemID> = []
-        side.walk(snapshot) { lane, card in universe.insert(card?.id ?? lane.id) }
-        return universe
     }
 }
 
@@ -442,8 +359,8 @@ public final class TransientBoardState {
     // MARK: Per-open values
 
     /// The lane that most recently held selection or a creation **in this window session** —
-    /// 04-interactions.md's ⌘N target rule's fallback when nothing (or a tombstoned something) is
+    /// 04-interactions.md's ⌘N target rule's fallback when nothing (or a trash selection, which
-    /// selected, before the last resort of the first lane.
+    /// never anchors creation) is selected, before the last resort of the first lane.
     ///
     /// It is a *memory of a gesture*, not derived state: with an empty selection there is nothing
     /// in the snapshot that could reconstruct which lane the user was last working in, which is
@@ -454,7 +371,7 @@ public final class TransientBoardState {
     /// is no target at all; `NewCardTarget` then falls through to the first lane.
     public private(set) var lastActiveLaneID: ItemID?
 
-    /// Whether the trash quasi-lane is showing (03-board-ui.md ▸ Trash).
+    /// Whether the trash column is showing (03-board-ui.md ▸ Trash).
     ///
     /// **Hidden on every open, never persisted**: visiting the trash is an errand, not a layout
     /// choice, so it does not belong in the board registry beside window frames
@@ -480,8 +397,8 @@ public final class TransientBoardState {
     ///
     /// Deliberately **not** filtered against the snapshot: a caller selects what it is rendering, and
     /// `resolve(against:)` on the next reload is what keeps the set honest over time.
-    public func select(_ ids: Set<ItemID>, liveness: Liveness, anchor: ItemID? = nil, head: ItemID? = nil) {
+    public func select(_ ids: Set<ItemID>, in container: ItemContainer, anchor: ItemID? = nil, head: ItemID? = nil) {
-        selection = ItemReferenceSet(ids: ids, liveness: liveness)
+        selection = ItemReferenceSet(ids: ids, container: container)
         let sole = ids.count == 1 ? ids.first : nil
         selectionAnchor = anchor ?? sole
         selectionHead = head ?? sole
@@ -666,16 +583,15 @@ public final class TransientBoardState {
     ///
     /// **Every item-referencing set is resolved independently.** They are re-grounded against the
     /// same snapshot but never against each other: a card leaving the selection must not disturb a
-    /// drag in flight or a pending cut that also held it, and each set carries its own liveness
+    /// drag in flight or a pending cut that also held it, and each set carries its own container.
-    /// side. Independence is what makes that a property of the code rather than of the order the
+    /// Independence is what makes that a property of the code rather than of the order the lines
-    /// lines happen to be in.
+    /// happen to be in.
     ///
     /// **The placeholder has its own two rules**, because it references a lane rather than items:
     ///
-    /// - **Discarded when its anchor lane is gone** — absent from the snapshot, or effectively
+    /// - **Discarded when its anchor lane is gone** — absent from the snapshot. "If the
-    ///   tombstoned. A tombstoned lane renders nowhere (03-board-ui.md collapses it to a single
+    ///   placeholder's lane vanished in the reload, it is discarded" (02-architecture.md); a lane
-    ///   trash entry), so its lane "vanished" in every sense 02-architecture.md means: "if the
+    ///   delete is physical now, so gone is the only way a lane goes.
-    ///   placeholder's lane vanished in the reload, it is discarded".
     /// - **Discarded as a hand-off** when it is `.awaitingArrival(id)` and `id`'s card is in the
     ///   snapshot. The real card arrived; the overlay's whole job was covering the gap between the
     ///   Writer's create and the watcher's round trip, and holding it a moment longer would draw the
@@ -687,25 +603,25 @@ public final class TransientBoardState {
     ///
     /// **The rename editor has one rule, and it is the vanish rule** (04-interactions.md ▸
     /// Grammar, "Inline rename tracks its target by UUID, and vanishing discards it"): a target
-    /// that is tombstoned, deleted, or gone discards the editor and its keystrokes silently.
+    /// that is trashed, deleted, or gone discards the editor and its keystrokes silently —
-    /// A foreign *move* is deliberately not a vanish — the editor follows the UUID and the commit
+    /// "entering the trash is a vanish from the board; nothing is ever written into a vanished
-    /// writes wherever the item now lives — which falls out for free from matching on identity
+    /// folder". A foreign *move between lanes* is deliberately not a vanish — the editor follows
-    /// rather than on position. Liveness is **effective**, so a card under a lane an agent just
+    /// the UUID and the commit writes wherever the card now lives — which falls out for free from
-    /// tombstoned vanishes with it.
+    /// matching on identity within the board container.
     ///
     /// **`lastActiveLaneID` is cleared when its lane goes**, for the reason 02-architecture.md
     /// gives every item-referencing piece of transient state: nothing may reference an item the
     /// current universe does not have. It is not an `ItemReferenceSet` only because it is one
     /// optional rather than a set on a side — the rule it obeys is the same one.
     ///
-    /// **`selectionAnchor` obeys it too**, on the *selection's* side: a range origin that vanished
+    /// **`selectionAnchor` obeys it too**, in the *selection's* container: a range origin that
-    /// or flipped liveness is gone, and the next ⇧-click acts as a plain click rather than ranging
+    /// vanished or crossed containers is gone, and the next ⇧-click acts as a plain click rather
-    /// from somewhere that renders nowhere. It deliberately does **not** have to stay *in* the
+    /// than ranging from somewhere that renders nowhere. It deliberately does **not** have to stay
-    /// selection — a ⌘-click that toggles the anchor's neighbour out leaves the anchor selected and
+    /// *in* the selection — a ⌘-click that toggles the anchor's neighbour out leaves the anchor
-    /// a range from it is still exactly what the user asked for.
+    /// selected and a range from it is still exactly what the user asked for.
     ///
     /// **The style editor tracks its target set live** (03-board-ui.md § Styling ▸ Controls,
-    /// settled): a member that vanishes or flips liveness leaves the set — so the editor's
+    /// settled): a member that vanishes or crosses containers leaves the set — so the editor's
     /// mixed-state display recomputes off the survivors — and a set emptied by a foreign reload
     /// clears the session, which is how "the popover dismisses when it empties" reaches the screen.
     /// It never becomes a board session on the way; `StyleEditorSession.resolved(against:)` owns
@@ -725,25 +641,22 @@ public final class TransientBoardState {
         newCardPlaceholder = resolvedPlaceholder(against: snapshot)
         styleEditor = styleEditor?.resolved(against: snapshot)
 
-        // One universe computed once and asked three questions — the rename target's liveness, the
+        // One universe computed once and asked three questions — the rename target's container, the
         // last-active lane's, and (via the placeholder above, which asks its own way) the anchor's.
-        let live = ItemReferenceSet.idUniverse(of: snapshot, on: .live)
+        let board = ItemContainer.board.ids(in: snapshot)
-        if let editor = renameEditor, !live.contains(editor.targetID) {
+        if let editor = renameEditor, !board.contains(editor.targetID) {
             renameEditor = nil
         }
-        if let lane = lastActiveLaneID, !live.contains(lane) {
+        if let lane = lastActiveLaneID, !board.contains(lane) {
             lastActiveLaneID = nil
         }
         if selectionAnchor != nil || selectionHead != nil {
-            // The selection's side, because that is the side both cursors live on by construction —
+            // The selection's container, because that is where both cursors live by construction —
-            // every route that sets either sets the selection to the same side in the same call. A
+            // every route that sets either sets the selection to the same container in the same
-            // vanished or liveness-flipped cursor is gone, which is the rule every item reference
+            // call. A vanished or container-crossed cursor is gone, which is the rule every item
-            // here gets: "a flip is a vanish from its side of the boundary". The head then re-derives
+            // reference here gets. The head then re-derives from the selection's last member on the
-            // from the selection's last member on the next arrow, which is the same fallback an
+            // next arrow, which is the same fallback an anchorless ⇧-arrow already uses.
-            // anchorless ⇧-arrow already uses.
+            let universe = selection.container == .board ? board : selection.container.ids(in: snapshot)
-            let universe = selection.liveness == .live
-                ? live
-                : ItemReferenceSet.idUniverse(of: snapshot, on: selection.liveness)
             if let anchor = selectionAnchor, !universe.contains(anchor) { selectionAnchor = nil }
             if let head = selectionHead, !universe.contains(head) { selectionHead = nil }
         }
@@ -776,13 +689,14 @@ public final class TransientBoardState {
     /// under a live filter is a gesture in flight, not a set the filter has any claim on. The
     /// editor's absence is the settled ruling in person: "an open inline rename survives the filter
     /// hiding its card … the vanish-discard rule stays reserved for true liveness flips"
-    /// (`RenameEditor`), so a foreign edit that stops the renaming card matching drops it from the
+    /// (`RenameEditor`) — read for the materialized trash, true container crossings — so a foreign
-    /// selection here and leaves the keystrokes exactly where the user left them.
+    /// edit that stops the renaming card matching drops it from the selection here and leaves the
+    /// keystrokes exactly where the user left them.
     public func constrainToSearch(in snapshot: BoardModel) {
         let filter = SearchFilter(query: searchQuery)
         guard filter.isActive else { return }
 
-        let universe = filter.visibleIDs(in: snapshot, on: selection.liveness)
+        let universe = filter.visibleIDs(in: snapshot, container: selection.container)
         selection = selection.constrained(to: universe)
         if let anchor = selectionAnchor, !universe.contains(anchor) { selectionAnchor = nil }
         if let head = selectionHead, !universe.contains(head) { selectionHead = nil }
@@ -792,9 +706,7 @@ public final class TransientBoardState {
     private func resolvedPlaceholder(against snapshot: BoardModel) -> NewCardPlaceholder? {
         guard let placeholder = newCardPlaceholder else { return nil }
 
-        guard let anchor = snapshot.lanes.first(where: { $0.id == placeholder.laneID }),
+        guard snapshot.lanes.contains(where: { $0.id == placeholder.laneID }) else { return nil }
-              !anchor.isDeleted
-        else { return nil }
 
         if case let .awaitingArrival(id) = placeholder.phase,
            snapshot.lanes.contains(where: { $0.cards.contains { $0.id == id } }) {

Kanban/LiveStore/TrashModel.swift

@@ -1,409 +1,147 @@
 import Foundation
 
-// MARK: - TrashEntry
-
-/// One row of the trash quasi-lane (03-board-ui.md § Trash).
-///
-/// **Two cases, not one**, because a tombstoned lane is not a tombstoned card wearing a different
-/// symbol: it is "a single restorable entry" that *subsumes* everything beneath it, and Put Back on
-/// it "returns [the lane] whole, cards and all" (04-interactions.md ▸ The trash). The card count it
-/// carries is part of the entry rather than something the row re-derives, because the rule for what
-/// that number means is subtle enough to want one home — see `TrashModel.entries(of:)`.
-///
-/// The card case carries its lane's id for the same reason `BoardStore.liveItem` returns two
-/// components rather than a URL: the row's folder is `<root>/<lane>/<card>`, and the root is the
-/// store's to supply — a mid-session folder rename may have moved it.
-public enum TrashEntry: Identifiable, Sendable, Equatable {
-
-    /// A card carrying its own `deleted:` under a **live** lane. A card whose lane is tombstoned
-    /// never becomes one of these — see `TrashModel.entries(of:)`'s ancestor walk.
-    case card(Card, laneID: ItemID)
-
-    /// A tombstoned lane, and how many of its cards Put Back would return to the board.
-    case lane(Lane, returningCardCount: Int)
-
-    public var id: ItemID {
-        switch self {
-        case let .card(card, _): card.id
-        case let .lane(lane, _): lane.id
-        }
-    }
-
-    /// The title as written, or `nil` for an untitled item — "Untitled" is a rendering, never a
-    /// value (03-board-ui.md § Card face).
-    public var title: String? {
-        switch self {
-        case let .card(card, _): card.title.value
-        case let .lane(lane, _): lane.title.value
-        }
-    }
-
-    /// Which kind of row this is — the axis 04-interactions.md ▸ The trash makes a selection
-    /// homogeneous over ("a selection never mixes card entries and lane entries").
-    public var isLaneEntry: Bool {
-        if case .lane = self { return true }
-        return false
-    }
-
-    /// The `icon` field this row renders, so the row's symbol obeys the same lenient rule the board
-    /// face does (`ItemSymbol`).
-    public var icon: FieldValue<String> {
-        switch self {
-        case let .card(card, _): card.icon
-        case let .lane(lane, _): lane.icon
-        }
-    }
-
-    /// Where this row's folder sits under the board root.
-    public var path: TrashModel.ItemPath {
-        switch self {
-        case let .card(card, laneID): TrashModel.ItemPath(laneID: laneID, cardID: card.id)
-        case let .lane(lane, _): TrashModel.ItemPath(laneID: lane.id, cardID: nil)
-        }
-    }
-}
-
 // MARK: - TrashModel
 
-/// The trash quasi-lane's contents, as a pure function of a snapshot (`TrashModelTests`) —
+/// What is left of the trash as a *model* once the trash became a folder — 03-board-ui.md § Trash's
-/// 03-board-ui.md § Trash's Contents rules with nothing else mixed in.
+/// **materialized** container (resettled 2026-07-28).
 ///
-/// **Pure because the trash is a pure view.** "Tombstoned cards keep their `deleted:` key and stay
+/// ### Almost nothing, and that is the point of the pivot
-/// exactly where they are on disk; nothing about the storage schema is trash-specific", so there is
-/// no trash *state* anywhere — only this derivation, re-run against whatever snapshot is current.
-/// A reload therefore rebuilds the rows for free, exactly as it rebuilds the lanes.
 ///
-/// The three rules it owns, each of which the design settles explicitly:
+/// The tombstone model needed a whole derivation layer: an entry type, an absolute ancestor walk, a
+/// returning-card count, a deterministic `deleted`-timestamp sort, and a paths function that had to
+/// restate which items were addressable. All of it is gone. A trashed card is "an ordinary card in a
+/// special place", so the trash's contents *are* `snapshot.trash` — already parsed by the same card
+/// parse the lanes use, already in `order` display order, already newest-first because every arrival
+/// mints a rank above the current top. There is nothing to derive, and no second definition to keep
+/// in step with the loader's.
 ///
-/// 1. **The absolute ancestor walk.** A tombstoned lane's entry subsumes everything beneath it — "a
+/// What genuinely remains is what the *commands* need and no view can answer: the two purge
-///    card that carries its own `deleted:` under a tombstoned lane has **no row of its own**". There
+/// confirmations' phrasing, and the menu validation that stages Delete by place. Both are pure
-///    is no trash carve-out from 01-storage-format.md's consumer rule. This rule is not spelled
+/// functions of a snapshot and a selection (`TrashModelTests`), so an alert's sentence is testable
-///    here: it is `Liveness.walk`'s, because the trashed **universe** every item-referencing set is
+/// without an alert on screen.
-///    held to *is* this row set — "universe and rows are one function" (02-architecture.md § Changes
-///    from Kanban, settled). Everything below that asks what is in the trash asks that walk, so the
-///    rows a user sees and the ids a selection may hold cannot drift apart.
-/// 2. **The returning count.** A lane entry's number "counts what Put Back returns to the board —
-///    cards without their own flag; individually tombstoned descendants aren't in that number, since
-///    they come back to the *trash*".
-/// 3. **The deterministic sort.** Newest `deleted` first; ties by folder name ascending; an
-///    unparseable stamp sorts as *oldest*, after every dated entry, folder-name-ordered among its
-///    kind; lane entries interleave in the same single ordering by their own stamp. The order is
-///    load-bearing for input — "arrow walks, ⇧-ranges, and the rubber band all read it" — so it is
-///    total, not merely stable.
 public enum TrashModel {
 
-    // MARK: - Where a row lives
-
-    /// An item's folder, as its identity components rather than as a URL.
-    ///
-    /// Same shape and same reasoning as `BoardStore.liveItem`'s return: the caller builds the URL off
-    /// the store's *current* `rootURL`, so a board renamed or moved mid-session writes at the new
-    /// location (02-architecture.md § Write-failure surfacing).
-    public struct ItemPath: Sendable, Equatable {
-        public let laneID: ItemID
-        /// `nil` for a lane — the path is then the lane folder itself.
-        public let cardID: ItemID?
-
-        public init(laneID: ItemID, cardID: ItemID?) {
-            self.laneID = laneID
-            self.cardID = cardID
-        }
-
-        public var isLane: Bool { cardID == nil }
-
-        /// This path resolved under a board root.
-        public func folder(under root: URL) -> URL {
-            var url = root.appendingPathComponent(laneID.rawValue, isDirectory: true)
-            if let cardID {
-                url.append(component: cardID.rawValue, directoryHint: .isDirectory)
-            }
-            return url
-        }
-    }
-
-    // MARK: - Entries
-
-    /// The trash's rows, in the order the quasi-lane shows them.
-    ///
-    /// **Which items are rows is not decided here** — it is `Liveness.trashed.walk`, the same walk
-    /// `ItemReferenceSet.idUniverse(of:on:)` reads, because the trashed universe and this row set are
-    /// one function. Its `continue` on a tombstoned lane is the absolute ancestor walk: such a lane
-    /// contributes exactly one entry and its cards contribute none, whatever their own flags say.
-    ///
-    /// What is left for this function is what a row *carries* — the returning count and the sort
-    /// inputs — and the order it shows in, neither of which any other caller of the walk wants.
-    public static func entries(of snapshot: BoardModel) -> [TrashEntry] {
-        var rows: [Row] = []
-        Liveness.trashed.walk(snapshot) { lane, card in
-            if let card {
-                rows.append(Row(
-                    entry: .card(card, laneID: lane.id),
-                    deleted: card.deleted.value,
-                    name: card.id.rawValue
-                ))
-            } else {
-                // Rule 2: only the cards *without* their own flag come back with the lane. The ones
-                // that carry a flag stay tombstoned and get their rows back in the trash — which is
-                // why Put Back on such a card is deliberately two steps.
-                let returning = lane.cards.filter { !$0.isDeleted }.count
-                rows.append(Row(
-                    entry: .lane(lane, returningCardCount: returning),
-                    deleted: lane.deleted.value,
-                    name: lane.id.rawValue
-                ))
-            }
-        }
-        return rows.sorted(by: isOrdered).map(\.entry)
-    }
-
-    /// Whether the board has anything in its trash at all — the "non-empty" half of Empty Trash…'s
-    /// menu validation, which "reads the board's tombstones, not the filtered view" (03 ▸ Trash).
-    ///
-    /// The walk's non-emptiness in **short-circuit form**, which is the one place the rule is
-    /// restated and only because stopping early is the whole point: a tombstoned lane is a row
-    /// outright, and under a live lane any own-flagged card is one. There is deliberately no third
-    /// clause for a card beneath a tombstoned lane — the lane has already answered `true` for it.
-    /// `TrashModelTests` pins the equivalence to `entries(of:).isEmpty` so the shortcut cannot drift.
-    public static func isEmpty(_ snapshot: BoardModel) -> Bool {
-        !snapshot.lanes.contains { lane in
-            lane.isDeleted || lane.cards.contains(where: \.isDeleted)
-        }
-    }
-
-    /// One entry's sort inputs, kept beside it so the comparator never re-reads the model.
-    private struct Row {
-        let entry: TrashEntry
-        /// The parsed `deleted` stamp, or `nil` when the value is present but unparseable —
-        /// 01-storage-format.md's unusable-timestamp rule, which still deletes (presence, not
-        /// validity) but supplies no position in time.
-        let deleted: Date?
-        /// The folder name, byte-for-byte — the tie-break the loader's display order already uses
-        /// (`Ranks.sortedForDisplay`, `name: { $0.id.rawValue }`), so the trash breaks ties the same
-        /// way the board does.
-        let name: String
-    }
-
-    /// The sort, stated once: newest first among dated entries, then every undated entry.
-    ///
-    /// **Undated sorts oldest, not first.** "A corrupt stamp must not outrank fresh deletions for the
-    /// trash's most prominent rows" — so an unparseable value loses to every real timestamp, however
-    /// old, and orders by folder name among its own kind.
-    private static func isOrdered(_ lhs: Row, _ rhs: Row) -> Bool {
-        switch (lhs.deleted, rhs.deleted) {
-        case let (left?, right?):
-            return left == right ? lhs.name < rhs.name : left > right
-        case (.some, nil):
-            return true
-        case (nil, .some):
-            return false
-        case (nil, nil):
-            return lhs.name < rhs.name
-        }
-    }
-
-    // MARK: - Paths for the trash's writes
-
-    /// The folders `ids` names, in display order, restricted to one liveness side.
-    ///
-    /// **The membership rule is not restated here** — it is `Liveness.walk`'s, the same one
-    /// `ItemReferenceSet.idUniverse` and `entries(of:)` read — spelled in *paths* rather than ids
-    /// because a write needs to know where the item is. So the trashed side is the trash's rows and
-    /// nothing besides: a card beneath a tombstoned lane is not individually addressable, which costs
-    /// nothing (it has no row for a user to act on, so no command can name it) and buys the guarantee
-    /// that every path this hands a writer names something the board would draw.
-    ///
-    /// **A tombstoned lane still takes its subtree with it**, and that is subsumption rather than
-    /// omission: its path is the lane *folder*, and removing a folder removes what is inside it. Put
-    /// Back on it restores the lane and every card that rode along; Delete Immediately on it purges
-    /// the whole tree, own-flag cards included — the outcome the lane entry's confirmation sentence
-    /// exists to warn about (`message(lanes:unrecoverable:)`).
-    ///
-    /// Display order — lanes left to right, each lane then its cards — rather than the caller's set
-    /// iteration order, which is not an order at all: a batch that fails partway must fail the same
-    /// way twice (`BoardStore.styleSubjects` makes the same choice for the same reason). The walk
-    /// visits in exactly that order, so this is a filter over it and never a sort.
-    public static func paths(of ids: Set<ItemID>, on side: Liveness, in snapshot: BoardModel) -> [ItemPath] {
-        guard !ids.isEmpty else { return [] }
-        var result: [ItemPath] = []
-        side.walk(snapshot) { lane, card in
-            guard ids.contains(card?.id ?? lane.id) else { return }
-            result.append(ItemPath(laneID: lane.id, cardID: card?.id))
-        }
-        return result
-    }
-
-    /// Every folder Empty Trash removes — "emptying purges every tombstone on the board, filter or
-    /// no filter" (03 ▸ Trash).
-    ///
-    /// `paths(of:on:in:)` on the trashed side with **no id filter at all**, which is the strongest
-    /// form of that guarantee: the command's scope is the trashed universe itself, so it cannot
-    /// narrow to a selection any more than it can narrow to the search.
-    ///
-    /// **A tombstoned lane contributes only itself**, and that is not an omission: removing the lane
-    /// folder removes the tree beneath it, own-flag cards included. Listing those cards as well would
-    /// be redundant purges of paths the first removal already took (harmless — `purgeItem` treats a
-    /// folder that is already gone as success — but noise) and would require a second, broader
-    /// definition of "in the trash" than the one every other caller reads.
-    public static func emptyTrashTargets(in snapshot: BoardModel) -> [ItemPath] {
-        var result: [ItemPath] = []
-        Liveness.trashed.walk(snapshot) { lane, card in
-            result.append(ItemPath(laneID: lane.id, cardID: card?.id))
-        }
-        return result
-    }
-
     // MARK: - Counts and phrasing
 
-    /// How many lane entries and card entries a set of entries holds — the confirmation dialogs'
+    /// "41 cards", "1 card" — 06-history-undo.md's **plural folding**, which is all the folding a
-    /// only input beyond the item titles.
+    /// cards-only container can need ("Cards only. Lanes are never trashed" — 03-board-ui.md).
-    public struct EntryCounts: Sendable, Equatable {
+    public static func phrase(_ count: Int) -> String {
-        public var lanes: Int = 0
+        "\(count) card\(count == 1 ? "" : "s")"
-        public var cards: Int = 0
-
-        public var total: Int { lanes + cards }
-        public var isEmpty: Bool { total == 0 }
-    }
-
-    public static func counts(of entries: [TrashEntry]) -> EntryCounts {
-        var counts = EntryCounts()
-        for entry in entries {
-            if entry.isLaneEntry { counts.lanes += 1 } else { counts.cards += 1 }
-        }
-        return counts
-    }
-
-    /// The counts a set of `ItemPath`s describes — the same two numbers, from the shape the write
-    /// path actually carries.
-    public static func counts(of paths: [ItemPath]) -> EntryCounts {
-        var counts = EntryCounts()
-        for path in paths {
-            if path.isLane { counts.lanes += 1 } else { counts.cards += 1 }
-        }
-        return counts
-    }
-
-    /// "2 lanes and 3 cards", "41 cards", "1 lane" — 06-history-undo.md's **plural folding** applied
-    /// to a mixed trash selection.
-    ///
-    /// An empty count reads "nothing", which no caller renders: both confirmations refuse to open on
-    /// an empty scope. It is spelled anyway so the function is total.
-    public static func phrase(_ counts: EntryCounts) -> String {
-        switch (counts.lanes, counts.cards) {
-        case (0, 0): "nothing"
-        case let (0, cards): plural(cards, "card")
-        case let (lanes, 0): plural(lanes, "lane")
-        case let (lanes, cards): "\(plural(lanes, "lane")) and \(plural(cards, "card"))"
-        }
-    }
-
-    private static func plural(_ count: Int, _ noun: String) -> String {
-        "\(count) \(noun)\(count == 1 ? "" : "s")"
     }
 
     // MARK: - Confirmations
 
     /// A purge confirmation's three strings, built once and rendered by the window's alert.
     ///
-    /// A value rather than a view so the phrasing rules — plural folding, naming a sole item, the
+    /// A value rather than a view so the phrasing rules — plural folding, naming a sole item, and
-    /// lane caveat, and whether the loss is actually irreversible — are testable without an alert on
+    /// whether the loss is actually irreversible — are testable without an alert on screen.
-    /// screen (`TrashModelTests`).
     public struct PurgePrompt: Sendable, Equatable {
         public let title: String
         public let message: String
         public let confirmTitle: String
     }
 
-    /// Delete Immediately's alert — "the alert stands between one keystroke and unrecoverable
+    /// The alert in front of a **permanent** card delete — the trash's own ⌫/⌘⌫ and File ▸ Delete
-    /// deletion" (03-board-ui.md § Trash).
+    /// Immediately alike (03-board-ui.md § Trash: "Both confirm exactly where the loss is real ...
+    /// the alert stands between one keystroke and unrecoverable deletion").
     ///
-    /// A sole item is **named**; several fold into counts. `nil` when the ids name nothing
+    /// `container` is where the command found the cards: the trash for the trash's Delete, the board
-    /// tombstoned, which is also the command's own refusal — so the prompt and the action can never
+    /// for a Delete Immediately that skips the trash from a lane. The prompt reads the same either
+    /// way — what is being asked is whether to destroy these cards, and where they happen to be
+    /// sitting is not the question.
+    ///
+    /// A sole card is **named**; several fold into a count. `nil` when the ids name nothing in that
+    /// container, which is also the command's own refusal — so the prompt and the action can never
     /// disagree about whether there is anything to purge.
     public static func purgePrompt(
         for ids: Set<ItemID>,
-        in snapshot: BoardModel,
+        in container: ItemContainer,
+        snapshot: BoardModel,
         unrecoverable: Bool
     ) -> PurgePrompt? {
-        let targets = paths(of: ids, on: .trashed, in: snapshot)
+        let targets = ItemPath.resolve(ids, in: container, snapshot: snapshot).filter { !$0.isLane }
         guard !targets.isEmpty else { return nil }
 
-        let counts = counts(of: targets)
         let subject: String
         if targets.count == 1, let only = targets.first {
             subject = "\u{201C}\(displayName(of: only, in: snapshot))\u{201D}"
         } else {
-            subject = phrase(counts)
+            subject = phrase(targets.count)
         }
         return PurgePrompt(
             title: "Permanently delete \(subject)?",
-            message: message(lanes: counts.lanes, unrecoverable: unrecoverable),
+            message: message(unrecoverable: unrecoverable),
             confirmTitle: "Delete"
         )
     }
 
-    /// Empty Trash…'s alert — **always shown** ("bulk scope, not per-item recoverability, is what it
+    /// Empty Trash…'s alert — **always shown** ("Empty Trash… confirms everywhere"), and always
-    /// guards"), and always naming the **true count**: every tombstone on the board, never the
+    /// naming the **true count**: every card in `.trash/`, never the filtered view (03-board-ui.md §
-    /// filtered view.
+    /// Trash: "search-independent, the confirmation naming the card count").
     ///
-    /// Counts rather than names even for a single entry, because the command is about the trash
+    /// Counts rather than names even for a single card, because the command is about the trash
-    /// rather than about an item: "Permanently delete 41 cards" is the design's own example phrasing
+    /// rather than about an item: "Permanently delete 41 cards" is the design's own example phrasing.
-    /// (06-history-undo.md's plural folding).
     public static func emptyTrashPrompt(in snapshot: BoardModel, unrecoverable: Bool) -> PurgePrompt? {
-        let counts = counts(of: emptyTrashTargets(in: snapshot))
+        guard !snapshot.trash.isEmpty else { return nil }
-        guard !counts.isEmpty else { return nil }
         return PurgePrompt(
-            title: "Permanently delete \(phrase(counts))?",
+            title: "Permanently delete \(phrase(snapshot.trash.count))?",
-            message: message(lanes: counts.lanes, unrecoverable: unrecoverable),
+            message: message(unrecoverable: unrecoverable),
             confirmTitle: "Delete"
         )
     }
 
-    /// The alert's body: what a lane takes with it, and whether any of it comes back.
+    /// The alert's body: whether any of it comes back.
     ///
-    /// The lane sentence is not decoration — a lane entry's row says "3 cards" (what Put Back would
+    /// The tombstone era's second sentence — "Deleting a lane also deletes every card inside it" —
-    /// return), while purging the lane folder takes *every* card inside it, individually tombstoned
+    /// is gone with the lane entries it warned about: no purge path reaches a lane any more
-    /// ones included. That gap is exactly what a confirmation is for.
+    /// (`ItemPath.isLane` is filtered out above, and lane deletion is its own physical command with
-    private static func message(lanes: Int, unrecoverable: Bool) -> String {
+    /// undo as its net).
-        var parts: [String] = []
+    private static func message(unrecoverable: Bool) -> String {
-        if lanes > 0 {
-            parts.append("Deleting a lane also deletes every card inside it.")
-        }
         // m7-git: on a git board the content stays reachable in history, so the second sentence is
         // the honest one — and Delete Immediately does not confirm there at all
         // (`BoardStore.purgeIsUnrecoverable`).
-        parts.append(unrecoverable
+        unrecoverable
             ? "This can\u{2019}t be undone."
-            : "The board\u{2019}s history still has them.")
+            : "The board\u{2019}s history still has them."
-        return parts.joined(separator: " ")
     }
 
-    /// What to call an item in a prompt — its title, or the "Untitled" rendering.
+    /// What to call a card in a prompt — its title, or the "Untitled" rendering.
     ///
-    /// Total by construction: a path whose item has gone since the prompt was asked for reads
+    /// Total by construction: a path whose card has gone since the prompt was asked for reads
     /// "Untitled" rather than failing, which is the same shrug every other vanished-target rule in
     /// the app gives.
     private static func displayName(of path: ItemPath, in snapshot: BoardModel) -> String {
-        guard let lane = snapshot.lanes.first(where: { $0.id == path.laneID }) else { return "Untitled" }
+        switch path {
-        guard let cardID = path.cardID else { return lane.title.value ?? "Untitled" }
+        case let .lane(id):
-        return lane.cards.first { $0.id == cardID }?.title.value ?? "Untitled"
+            return snapshot.lanes.first { $0.id == id }?.title.value ?? "Untitled"
+        case let .card(lane, id):
+            return snapshot.lanes.first { $0.id == lane }?
+                .cards.first { $0.id == id }?.title.value ?? "Untitled"
+        case let .trashCard(id):
+            return snapshot.trash.first { $0.id == id }?.title.value ?? "Untitled"
+        }
     }
 
     // MARK: - Menu validation
 
-    /// Whether File ▸ Delete has something to tombstone — a **live**, non-empty selection that still
+    /// Whether File ▸ Delete has something to act on — **staged by place, but validated once**
-    /// names something the board renders.
+    /// (04-interactions.md ▸ The map, resettled 2026-07-28: "File ▸ Delete is the chord's only
+    /// owner — no twin menu items, no shared-equivalent routing").
     ///
-    /// The liveness side is the whole of the binary: "menu validation stays binary — Delete for live
+    /// One predicate for both stagings, because there is only one item now: a board selection moves
-    /// selections, Put Back / Delete Immediately for tombstoned ones" (04 ▸ The trash). The
+    /// into the trash, a trash selection deletes permanently, and the command is enabled whenever
-    /// resolution against the snapshot is what keeps a selection the next reload will drop from
+    /// either names something the board still holds. The old mirror-image pair
-    /// enabling an item that would write nothing.
+    /// (which existed to make two ⌘⌫ twins enable exactly one of themselves) retired with Put Back.
     public static func canDelete(selection: ItemReferenceSet, in snapshot: BoardModel) -> Bool {
-        selection.liveness == .live && !paths(of: selection.ids, on: .live, in: snapshot).isEmpty
+        !ItemPath.resolve(selection.ids, in: selection.container, snapshot: snapshot).isEmpty
     }
 
-    /// Whether File ▸ Put Back and File ▸ Delete Immediately have something to act on — the exact
+    /// Whether File ▸ Delete Immediately has something to purge — **a card selection, from anywhere**
-    /// mirror of `canDelete`, which is what makes the two ⌘⌫ twins enable exactly one of themselves.
+    /// (11-command-nexus.md: "Board window, card selection — skips the trash from anywhere").
-    public static func canActOnTrash(selection: ItemReferenceSet, in snapshot: BoardModel) -> Bool {
+    ///
-        selection.liveness == .trashed && !paths(of: selection.ids, on: .trashed, in: snapshot).isEmpty
+    /// Cards only, in either container: a lane's delete is physical already and has undo as its net,
+    /// so there is nothing for "skip the trash" to mean on one.
+    public static func canDeleteImmediately(selection: ItemReferenceSet, in snapshot: BoardModel) -> Bool {
+        ItemPath.resolve(selection.ids, in: selection.container, snapshot: snapshot).contains { !$0.isLane }
     }
 }

Kanban/Storage/BoardLoader.swift

@@ -744,7 +744,7 @@ public struct LegacyTombstone: Sendable, Equatable {
 ///
 /// `title` is the card's as written, `nil` for an untitled one: "Untitled" is a rendering, never a
 /// value (03-board-ui.md § Card face), so the phrasing layer decides what to call it. The path is
-/// carried as its two identity components rather than as a URL, `BoardStore.liveItem`'s convention,
+/// carried as its two identity components rather than as a URL, `ItemPath`'s convention,
 /// so the write derives its path from the store's *current* root.
 public struct LooseCardFiles: Sendable, Equatable {
     public let laneID: ItemID

Kanban/Storage/BoardWriter.swift

@@ -1391,12 +1391,18 @@ public enum BoardWriter: Sendable {
         try? FileManager.default.setAttributes([.posixPermissions: permissions], ofItemAtPath: url.path)
     }
 
-    // MARK: - Tombstone (retiring)
+    // MARK: - Tombstone (retired, awaiting removal)
     //
     // The tombstone model is retired (01-storage-format.md § Deletion, resettled 2026-07-28): the
-    // app's delete is the physical move above, and no `deleted:` key is ever written again. The
+    // app's delete is the physical move above, and no `deleted:` key is ever written again.
-    // three calls below are kept only while their callers are still being moved across — the
+    //
-    // migration removes the last keys any of them could act on, and they go with the last consumer.
+    // **These have no app callers left.** Every consumer moved across with the store swap — the
+    // delete is `deleteCardToTrash`, the lane delete is `removeLane`, the restore is an ordinary
+    // `moveItem`, and the legacy keys are handled by the two `migrate…` calls above. They are kept
+    // here for exactly one more beat because `purgeItem` below is still live (Delete Immediately's
+    // board-side purge) and the three read as one family; the pair and
+    // `stripTombstonedChildren` go together in the trash's cleanup pass, with the suites that
+    // still pin their byte-level behaviour.
 
     /// Tombstones a lane or card in place: writes `deleted: <now>` into its own `index.md` —
     /// the whole of a delete (01-storage-format.md § Deletion). The folder never moves, never

Kanban/UI/Board/BoardCommands.swift

@@ -141,14 +141,14 @@ struct OpenCardCommand: View {
         return store.isEditingInline || soleSelectedCard != nil
     }
 
-    /// The sole selected **live card**, or `nil`. A lane, a multi-selection and a tombstoned
+    /// The sole selected **board card**, or `nil`. A lane, a multi-selection and a trash
-    /// selection all answer `nil` — "everything edit-shaped is disabled on tombstoned selections"
+    /// selection all answer `nil` — "everything edit-shaped is disabled on trash selections … Open
-    /// (04 ▸ The trash), and a card window is tied to one card.
+    /// Card, Rename, Style…" (04 ▸ The trash), and a card window is tied to one card.
     private var soleSelectedCard: ItemID? {
         guard let store else { return nil }
         let selection = store.selection
-        guard selection.liveness == .live, selection.ids.count == 1, let id = selection.ids.first,
+        guard selection.container == .board, selection.ids.count == 1, let id = selection.ids.first,
-              BoardStore.liveItem(id, in: store.snapshot)?.cardID != nil
+              BoardStore.boardItem(id, in: store.snapshot)?.cardID != nil
         else { return nil }
         return id
     }
@@ -161,8 +161,8 @@ struct OpenCardCommand: View {
             // holds it — and re-checked after, because one of those paths is *the lane vanished*.
             let lane = placeholder.laneID
             let created = store.commitPlaceholder()
-            if store.snapshot.lanes.contains(where: { $0.id == lane && !$0.isDeleted }) {
+            if store.snapshot.lanes.contains(where: { $0.id == lane }) {
-                store.select([lane], liveness: .live)
+                store.select([lane], in: .board)
             }
             if let created { open(created) }
             return
@@ -170,7 +170,7 @@ struct OpenCardCommand: View {
 
         if let editor = store.transient.renameEditor {
             let target = editor.targetID
-            let isCard = BoardStore.liveItem(target, in: store.snapshot)?.cardID != nil
+            let isCard = BoardStore.boardItem(target, in: store.snapshot)?.cardID != nil
             store.commitRename()
             if isCard { open(target) }
             return
@@ -269,8 +269,8 @@ struct MoveLaneCommands: View {
     private func destination(_ delta: Int) -> (lane: ItemID, index: Int)? {
         guard let store, store.acceptsBoardMutations else { return nil }
         let selection = store.selection
-        guard selection.liveness == .live, selection.ids.count == 1, let id = selection.ids.first else { return nil }
+        guard selection.container == .board, selection.ids.count == 1, let id = selection.ids.first else { return nil }
-        let lanes = SelectionGrammar.liveLanes(in: store.snapshot)
+        let lanes = SelectionGrammar.lanes(in: store.snapshot)
         // A card id is in no lane order, so this is also the "not a lane" test.
         guard let from = lanes.firstIndex(of: id) else { return nil }
         let to = from + delta
@@ -382,9 +382,9 @@ struct BoardInfoCommand: View {
 /// **lane's only rename path**: Return on a lane creates a card, so without this item a lane could
 /// never be renamed at all (04-interactions.md ▸ Selection).
 ///
-/// Validation is the sole-selected-live-item rule — card or lane, either kind, exactly one. A
+/// Validation is the sole-selected-board-item rule — card or lane, either kind, exactly one. A
-/// tombstoned selection never enables it: "everything edit-shaped is disabled on tombstoned
+/// trash selection never enables it: "everything edit-shaped is disabled on trash selections"
-/// selections" (04 ▸ The trash), which `ItemReferenceSet`'s liveness side answers directly.
+/// (04 ▸ The trash), which `ItemReferenceSet`'s container answers directly.
 struct BoardRenameCommand: View {
 
     @FocusedValue(\.boardStore) private var store
@@ -400,8 +400,8 @@ struct BoardRenameCommand: View {
     private var renameTarget: (id: ItemID, title: String?)? {
         guard let store, store.acceptsBoardMutations else { return nil }
         let selection = store.selection
-        guard selection.liveness == .live, selection.ids.count == 1, let id = selection.ids.first,
+        guard selection.container == .board, selection.ids.count == 1, let id = selection.ids.first,
-              let item = BoardStore.liveItem(id, in: store.snapshot)
+              let item = BoardStore.boardItem(id, in: store.snapshot)
         else { return nil }
         return (id: id, title: item.title)
     }
@@ -441,7 +441,7 @@ struct BoardStyleCommand: View {
         guard let store, store.acceptsBoardMutations else { return nil }
         let selection = store.selection
         guard !selection.isEmpty else { return .board }
-        guard selection.liveness == .live else { return nil }
+        guard selection.container == .board else { return nil }
         // Re-resolved against the snapshot on the way in, so the session starts out holding only
         // items that render — the same universe its own reload rule will hold it to.
         let live = selection.resolved(against: store.snapshot).ids
@@ -498,8 +498,8 @@ struct LaneWidthCommands: View {
     private var selectedLanes: [Lane] {
         guard let store, store.acceptsBoardMutations else { return [] }
         let selection = store.selection
-        guard selection.liveness == .live, !selection.isEmpty else { return [] }
+        guard selection.container == .board, !selection.isEmpty else { return [] }
-        return store.snapshot.lanes.filter { selection.ids.contains($0.id) && !$0.isDeleted }
+        return store.snapshot.lanes.filter { selection.ids.contains($0.id) }
     }
 
     /// `width` is ≥ 1 (03-board-ui.md § Lane), and an item whose only outcome is a no-op reads

Kanban/UI/Board/BoardDrops.swift

@@ -140,7 +140,7 @@ struct BoardDropContext {
               DragLocality.isSameBoard(proposal.boardRoot, store.rootURL),
               let laneID = proposal.laneID
         else { return }
-        guard !store.snapshot.lanes.contains(where: { $0.id == laneID && !$0.isDeleted }) else { return }
+        guard !store.snapshot.lanes.contains(where: { $0.id == laneID }) else { return }
         session.propose(nil)
     }
 
@@ -159,7 +159,7 @@ struct BoardDropContext {
     func retargetLanes() {
         guard session.isDraggingLanes, let cursor = stripCursor() else { return }
         let hidden = session.hiddenMembers(onBoardRooted: store.rootURL)
-        let resting = store.snapshot.lanes.filter { !$0.isDeleted && !hidden.contains($0.id) }
+        let resting = store.snapshot.lanes.filter { !hidden.contains($0.id) }
         let restingUnits = resting.map { LaneLayoutMath.displayUnits(of: $0) }
         let slot = DropSlotMath.laneSlot(
             cursorX: cursor.x,
@@ -181,14 +181,14 @@ struct BoardDropContext {
     /// one shared retarget, so they can never disagree" (DRAG-REORDER.md § Edge autoscroll).
     func retargetCards(inLane laneID: ItemID) {
         guard session.isDraggingCards, let cursor = globalCursor() else { return }
-        guard let lane = store.snapshot.lanes.first(where: { $0.id == laneID && !$0.isDeleted }) else {
+        guard let lane = store.snapshot.lanes.first(where: { $0.id == laneID }) else {
             revalidateProposal()
             return
         }
         guard let grid = registry.grids[laneID] else { return }
 
         let hidden = session.hiddenMembers(onBoardRooted: store.rootURL)
-        let rendered = lane.cards.filter { !$0.isDeleted && !hidden.contains($0.id) }
+        let rendered = lane.cards.filter { !hidden.contains($0.id) }
         let heights = rendered.map { registry.heights[$0.id] ?? LaneDropRegistry.nominalCardHeight }
         let placement = MasonryPlacement(
             columnCount: grid.columns,
@@ -218,7 +218,7 @@ struct BoardDropContext {
     /// answers `nil` there — and the proposal simply **holds**, which is the hysteresis contract.
     func retargetCardsFromStrip() {
         guard session.isDraggingCards, let cursor = stripCursor() else { return }
-        let lanes = store.snapshot.lanes.filter { !$0.isDeleted }
+        let lanes = store.snapshot.lanes
         let index = LaneLayoutMath.laneIndex(
             atX: cursor.x,
             unitCounts: lanes.map { LaneLayoutMath.displayUnits(of: $0) },
@@ -251,7 +251,7 @@ struct BoardDropContext {
         guard let sourceRoot = session.sourceRoot else { return false }
         return TrashDrop.accepts(
             kind: session.kind,
-            side: session.side,
+            container: session.container,
             isWithinBoard: DragLocality.isSameBoard(sourceRoot, store.rootURL),
             operation: session.resolveOperation(destinationRoot: store.rootURL),
             isTrashShown: store.transient.isTrashVisible,
@@ -338,14 +338,14 @@ struct BoardDropContext {
     /// cursor and the snapshot, so it cannot oscillate — the drawn layout never feeds back into it.
     func retargetFile(inLane laneID: ItemID, info: DropInfo) {
         guard acceptsFileDrop(info), let cursor = globalCursor(),
-              let lane = store.snapshot.lanes.first(where: { $0.id == laneID && !$0.isDeleted }),
+              let lane = store.snapshot.lanes.first(where: { $0.id == laneID }),
               let grid = registry.grids[laneID]
         else {
             session.proposeFile(nil)
             return
         }
 
-        let rendered = lane.cards.filter { !$0.isDeleted }
+        let rendered = lane.cards
         let heights = rendered.map { registry.heights[$0.id] ?? LaneDropRegistry.nominalCardHeight }
         let placement = MasonryPlacement(
             columnCount: grid.columns,
@@ -399,7 +399,7 @@ struct BoardDropContext {
             session.proposeFile(nil)
             return
         }
-        let lanes = store.snapshot.lanes.filter { !$0.isDeleted }
+        let lanes = store.snapshot.lanes
         let index = LaneLayoutMath.laneIndex(
             atX: cursor.x,
             unitCounts: lanes.map { LaneLayoutMath.displayUnits(of: $0) },
@@ -498,7 +498,7 @@ struct BoardDropContext {
     /// set's size (DRAG-REORDER.md § The drop commits).
     ///
     /// **One of the containers is not a destination but a verb.** A proposal naming the trash commits
-    /// a tombstone — the same write ⌫ performs, through the same `BoardWriter.deleteItem` in the same
+    /// a delete — the same write ⌫ performs, through the same `BoardWriter.deleteCardToTrash` in the same
     /// bracket (`BoardStore.deleteByDrag`), so a card deleted by drop is indistinguishable on disk
     /// from one deleted by keystroke (04-interactions.md ▸ The trash, settled 2026-07-28).
     ///
@@ -547,15 +547,16 @@ struct BoardDropContext {
         case .cards:
             if target.isTrash {
                 // **The pointer's delete gesture** (04-interactions.md ▸ The trash, settled
-                // 2026-07-28): "release tombstones the dragged card(s), exactly the ⌫ tombstone".
+                // 2026-07-28): "release moves the dragged card(s) into `.trash/`" — exactly the ⌫
+                // delete.
                 //
                 // The gate is re-asked here rather than trusted from the hover, because the one input
                 // that can change between them arrives through no callback at all: ⌥ pressed after
-                // the proposal stood would otherwise tombstone an original the copy grammar had just
+                // the proposal stood would otherwise delete an original the copy grammar had just
                 // promised to leave alone. A refusal cancels — items return, nothing is written.
                 guard TrashDrop.accepts(
                     kind: kind,
-                    side: session.side,
+                    container: session.container,
                     isWithinBoard: within,
                     operation: operation,
                     isTrashShown: store.transient.isTrashVisible,
@@ -571,27 +572,20 @@ struct BoardDropContext {
                 cancelDrop()
                 return false
             }
-            switch (session.side, within) {
+            // **The trash side needs no branch of its own any more** (04-interactions.md ▸ The
-            case (.live, true):
+            // trash, resettled 2026-07-28: "Drag-to-restore follows the locality model: dropping a
+            // trash card into one of its own board's lanes is an ordinary move to the drop
+            // position"). `moveCards`/`copyCards` resolve their members in either container, so a
+            // restore *is* the within-board move and a cross-board restore *is* the ordinary
+            // arrival — which is exactly what retiring the restore-specific machinery bought.
+            if within {
                 if operation == .copy {
                     store.copyCards(Set(ids), toLane: laneID, at: target.index)
                 } else {
                     store.moveCards(Set(ids), toLane: laneID, at: target.index)
                 }
-            case (.live, false):
-                store.receiveCards(folders, operation: operation, toLane: laneID, at: target.index)
-            case (.trashed, true):
-                // Drag-to-restore, and its ⌥ twin. "Dropping a tombstoned card into one of its own
-                // board's lanes restores it at the drop position"; ⌥ is the copy-out instead — a
-                // live copy lands and the tombstoned original stays (04-interactions.md ▸ The trash,
-                // "⌘C, ⌥-drag … always yield live copies").
-                if operation == .copy {
-                    store.receiveRestoredCards(folders, operation: .copy, toLane: laneID, at: target.index)
             } else {
-                    store.restoreByDrag(cardIDs: ids, intoLane: laneID, at: target.index)
+                store.receiveCards(folders, operation: operation, toLane: laneID, at: target.index)
-                }
-            case (.trashed, false):
-                store.receiveRestoredCards(folders, operation: operation, toLane: laneID, at: target.index)
             }
         }
 

Kanban/UI/Board/BoardView.swift

@@ -240,7 +240,7 @@ struct BoardView: View {
                 guard ClickModifier.current == .plain else { return }
                 store.clearSelection()
             }
-            .simultaneousGesture(marqueeControl.gesture(side: .live))
+            .simultaneousGesture(marqueeControl.gesture(in: .board))
     }
 
     /// The lanes and the drag's shadows, plus the trash column when it is shown.
@@ -269,7 +269,7 @@ struct BoardView: View {
             if isTrashVisible {
                 // Trailing, always — the quasi-lane has no position of its own to lose, which is
                 // also why it never appears in the drop proposal's inputs (those are built from
-                // `liveLanes`) and why the terminal slot clamps in front of it.
+                // `boardLanes`) and why the terminal slot clamps in front of it.
                 TrashLaneView(
                     store: store,
                     confirmations: confirmations,
@@ -427,11 +427,11 @@ struct BoardView: View {
         }
     }
 
-    /// The lanes the strip lays out, in snapshot order. **Tombstoned lanes render nowhere here** —
+    /// The lanes the strip lays out, in snapshot order — every lane the board has. Deleting a lane
-    /// 03-board-ui.md § Trash collapses each into a single restorable entry in the trash quasi-lane
+    /// is physical now (03-board-ui.md § Trash: "Cards only. Lanes are never trashed"), so a lane in
-    /// (a later card), and a lane that is not on the board consumes none of the window's width.
+    /// the snapshot is a lane on the board, with no hidden state to filter for.
-    private var liveLanes: [Lane] {
+    private var boardLanes: [Lane] {
-        store.snapshot.lanes.filter { !$0.isDeleted }
+        store.snapshot.lanes
     }
 
     // MARK: - Trash
@@ -443,16 +443,15 @@ struct BoardView: View {
         store.transient.isTrashVisible
     }
 
-    /// The trash's rows as the column is showing them — the shown trash "participates in the filter
+    /// The trash's cards as the column is showing them — the shown trash's cards "participate in
-    /// like any lane" (03-board-ui.md § Trash), and the arrows walk what is on screen
+    /// the filter exactly like any other card" (03-board-ui.md § Trash), and the arrows walk what is
-    /// (`TrashLaneView.entries` applies the identical predicate to the identical rows).
+    /// on screen (`TrashLaneView` applies the identical predicate to the identical cards).
     ///
     /// Read by the three keyboard destinations that reach into the column — the arrow origin's
-    /// order list, ⌥↑/⌥↓'s container, and ⌥→'s jump — so none of them can walk onto a row the
+    /// order list, ⌥↑/⌥↓'s container, and ⌥→'s jump — so none of them can walk onto a card the
     /// filter took away.
-    private var trashEntries: [TrashEntry] {
+    private var trashCards: [ItemID] {
-        let filter = store.searchFilter
+        SelectionGrammar.trashCards(in: store.snapshot, filter: store.searchFilter)
-        return TrashModel.entries(of: store.snapshot).filter { filter.matches($0) }
     }
 
     // MARK: - The drag
@@ -506,7 +505,7 @@ struct BoardView: View {
     ///   (`arrivingLaneUnits`).
     private func standardWidth(stripWidth: CGFloat) -> CGFloat {
         if resize.isActive { return resize.standard }
-        var units = LaneLayoutMath.totalUnits(of: liveLanes, trashUnits: isTrashVisible ? 1 : 0)
+        var units = LaneLayoutMath.totalUnits(of: boardLanes, trashUnits: isTrashVisible ? 1 : 0)
         units += arrivingLaneUnits
         return LaneLayoutMath.standardWidth(
             stripWidth: stripWidth,
@@ -569,7 +568,7 @@ struct BoardView: View {
     private var stripSlots: [StripSlot] {
         let session = appModel.dragSession
         let hidden = session.hiddenMembers(onBoardRooted: store.rootURL)
-        var slots = liveLanes.filter { !hidden.contains($0.id) }.map(StripSlot.lane)
+        var slots = boardLanes.filter { !hidden.contains($0.id) }.map(StripSlot.lane)
         guard let index = stripProposal else { return slots }
         let shadows = session.laneUnits.enumerated().map { StripSlot.shadow(index: $0.offset, units: $0.element) }
         slots.insert(contentsOf: shadows, at: min(max(0, index), slots.count))
@@ -596,10 +595,10 @@ struct BoardView: View {
         }
         guard !store.isEditingInline, !store.isReadOnly else { return .ignored }
         let selection = store.selection
-        guard selection.liveness == .live,
+        guard selection.container == .board,
               selection.ids.count == 1,
               let id = selection.ids.first,
-              let target = BoardStore.liveItem(id, in: store.snapshot)
+              let target = BoardStore.boardItem(id, in: store.snapshot)
         else { return .ignored }
 
         if target.cardID == nil {
@@ -614,9 +613,11 @@ struct BoardView: View {
     /// grammar so no second 'Delete' title exists" (11-command-nexus.md; 04-interactions.md ▸ The
     /// map).
     ///
-    /// Deliberately **live-only**: the nexus scopes this key to a live selection, and ⌫'s trash-side
+    /// **Both stagings**, unlike the tombstone era's live-only reading: "Plain ⌫ performs the same
-    /// role belongs to the ⌘⌫ twins, not to the bare key. A tombstoned selection is therefore inert
+    /// delete as fixed grammar" (04-interactions.md ▸ The map, resettled 2026-07-28), and the delete
-    /// here — Put Back is a chord.
+    /// is staged by place inside the store (`BoardStore.deleteSelection`) rather than by two menu
+    /// items sharing a chord. Put Back — the reason the bare key had to stay off the trash — is
+    /// retired with the tombstone model.
     ///
     /// Inert while an inline editor is open, like every grammar key: the field owns ⌫ as backspace,
     /// and a stray one reaching the board mid-edit would delete the item being renamed.
@@ -631,7 +632,7 @@ struct BoardView: View {
         }
         guard !store.isEditingInline, !store.isReadOnly else { return .ignored }
         let selection = store.selection
-        guard selection.liveness == .live, !selection.isEmpty else { return .ignored }
+        guard !selection.isEmpty else { return .ignored }
         store.deleteSelection()
         return .handled
     }
@@ -716,7 +717,7 @@ struct BoardView: View {
         guard let origin = arrowOrigin() else { return seed(direction, mode) }
         return origin.isLaneDomain
             ? laneArrow(direction, mode, from: origin.head)
-            : cardArrow(direction, mode, from: origin.head, on: origin.side)
+            : cardArrow(direction, mode, from: origin.head, in: origin.container)
     }
 
     private static func direction(of key: KeyEquivalent) -> NavigationMath.Direction? {
@@ -738,33 +739,32 @@ struct BoardView: View {
     /// Select All and a foreign reload leave the arrows somewhere sensible without any of them
     /// having to name a cursor.
     ///
-    /// The **trash's list is both kinds interleaved** (`TrashModel.entries`), because "arrows walk
+    /// The **trash's list is its cards**, top to bottom — there are no lane entries to interleave
-    /// every trash entry in its sorted order — card and lane entries alike" (04 ▸ The trash). The
+    /// any more (03-board-ui.md § Trash: "Cards only").
-    /// per-kind lists are the *range*'s business, not the walk's.
     ///
     /// Both lists are the **filtered** board (04 § Search: "arrow nav … read[s] it"), so the
     /// fallback lands on the last *visible* member rather than on a card the query hid.
-    private func arrowOrigin() -> (head: ItemID, side: Liveness, isLaneDomain: Bool)? {
+    private func arrowOrigin() -> (head: ItemID, container: ItemContainer, isLaneDomain: Bool)? {
         let selection = store.selection
         guard !selection.isEmpty else { return nil }
 
         let isLaneDomain: Bool
         let list: [ItemID]
-        switch selection.liveness {
+        switch selection.container {
-        case .live:
+        case .board:
             guard let kind = SelectionGrammar.kind(of: selection, in: store.snapshot) else { return nil }
             isLaneDomain = kind == .lane
-            list = SelectionGrammar.order(of: kind, on: .live, in: store.snapshot, filter: store.searchFilter)
+            list = SelectionGrammar.order(of: kind, in: .board, snapshot: store.snapshot, filter: store.searchFilter)
-        case .trashed:
+        case .trash:
             isLaneDomain = false
-            list = trashEntries.map(\.id)
+            list = trashCards
         }
 
         if let head = store.transient.selectionHead, list.contains(head) {
-            return (head, selection.liveness, isLaneDomain)
+            return (head, selection.container, isLaneDomain)
         }
         guard let last = list.last(where: { selection.ids.contains($0) }) else { return nil }
-        return (last, selection.liveness, isLaneDomain)
+        return (last, selection.container, isLaneDomain)
     }
 
     /// **An empty selection seeds at the first lane's first card** (04-interactions.md ▸ Grammar) —
@@ -779,8 +779,8 @@ struct BoardView: View {
         if mode == .jump, direction == .left || direction == .right {
             return jumpToEndLane(direction)
         }
-        guard let first = Self.firstCard(scanning: liveLanes, filter: store.searchFilter) else { return .handled }
+        guard let first = Self.firstCard(scanning: boardLanes, filter: store.searchFilter) else { return .handled }
-        replaceSelection(with: first, on: .live)
+        replaceSelection(with: first, in: .board)
         return .handled
     }
 
@@ -790,7 +790,7 @@ struct BoardView: View {
         _ direction: NavigationMath.Direction,
         _ mode: ArrowMode,
         from head: ItemID,
-        on side: Liveness
+        in container: ItemContainer
     ) -> KeyPress.Result {
         switch mode {
         case .step: step(direction, from: head)
@@ -798,7 +798,7 @@ struct BoardView: View {
         case .jump:
             switch direction {
             case .left, .right: jumpToEndLane(direction)
-            case .up, .down: jumpWithinContainer(direction, from: head, on: side)
+            case .up, .down: jumpWithinContainer(direction, from: head, in: container)
             }
         }
     }
@@ -817,7 +817,7 @@ struct BoardView: View {
               ),
               let next = marqueeTargets.targets[nextID]
         else { return .handled }
-        replaceSelection(with: next.id, on: next.side)
+        replaceSelection(with: next.id, in: next.container)
         return .handled
     }
 
@@ -837,7 +837,7 @@ struct BoardView: View {
                   among: marqueeTargets.all
               ),
               let next = marqueeTargets.targets[nextID],
-              next.side == origin.side,
+              next.container == origin.container,
               next.kind == origin.kind
         else { return .handled }
 
@@ -849,13 +849,13 @@ struct BoardView: View {
             from: anchor,
             to: next.id,
             kind: next.kind,
-            on: next.side,
+            in: next.container,
-            in: store.snapshot,
+            snapshot: store.snapshot,
             // The span is the *filtered* board's, so a range under a search collects exactly the
-            // rows between the two endpoints that are on screen (04 § Search: "ranges … read it").
+            // cards between the two endpoints that are on screen (04 § Search: "ranges … read it").
             filter: store.searchFilter
         ) else { return .handled }
-        store.select(ids, liveness: next.side, anchor: anchor, head: next.id)
+        store.select(ids, in: next.container, anchor: anchor, head: next.id)
         return .handled
     }
 
@@ -869,30 +869,30 @@ struct BoardView: View {
     private func jumpWithinContainer(
         _ direction: NavigationMath.Direction,
         from head: ItemID,
-        on side: Liveness
+        in container: ItemContainer
     ) -> KeyPress.Result {
-        let container: [ItemID]
+        let siblings: [ItemID]
         var lane: ItemID?
-        switch side {
+        switch container {
-        case .trashed:
+        case .trash:
-            container = trashEntries.map(\.id)
+            siblings = trashCards
-        case .live:
+        case .board:
             guard let home = store.snapshot.lanes.first(where: { lane in
-                !lane.isDeleted && lane.cards.contains { $0.id == head && !$0.isDeleted }
+                lane.cards.contains { $0.id == head }
             }) else { return .handled }
             lane = home.id
             // The container is what the lane is *showing*: a jump to "the lane's first card" under
             // a search means its first surviving card, not one the filter animated out.
             let filter = store.searchFilter
-            container = home.cards.filter { !$0.isDeleted && filter.matches($0) }.map(\.id)
+            siblings = home.cards.filter { filter.matches($0) }.map(\.id)
         }
 
-        guard let target = direction == .up ? container.first : container.last else { return .handled }
+        guard let target = direction == .up ? siblings.first : siblings.last else { return .handled }
         if direction == .up, target == head, let lane, store.selection.ids == [head] {
-            replaceSelection(with: lane, on: .live)
+            replaceSelection(with: lane, in: .board)
             return .handled
         }
-        replaceSelection(with: target, on: side)
+        replaceSelection(with: target, in: container)
         return .handled
     }
 
@@ -904,11 +904,11 @@ struct BoardView: View {
     /// the jump falls through to the last lane. Empty lanes are scanned past in both directions —
     /// a jump that landed nowhere because the end lane happens to be empty would be a dead key.
     private func jumpToEndLane(_ direction: NavigationMath.Direction) -> KeyPress.Result {
-        if direction == .right, isTrashVisible, let first = trashEntries.first {
+        if direction == .right, isTrashVisible, let first = trashCards.first {
-            replaceSelection(with: first.id, on: .trashed)
+            replaceSelection(with: first, in: .trash)
             return .handled
         }
-        let lanes = liveLanes
+        let lanes = boardLanes
         let filter = store.searchFilter
         // A lane the search emptied is scanned past exactly as an empty one is — the jump lands on
         // the first lane that is *showing* a card, which is what the user can see.
@@ -916,7 +916,7 @@ struct BoardView: View {
             ? Self.firstCard(scanning: lanes.reversed(), filter: filter)
             : Self.firstCard(scanning: lanes, filter: filter)
         guard let target else { return .handled }
-        replaceSelection(with: target, on: .live)
+        replaceSelection(with: target, in: .board)
         return .handled
     }
 
@@ -937,7 +937,7 @@ struct BoardView: View {
         _ mode: ArrowMode,
         from head: ItemID
     ) -> KeyPress.Result {
-        let lanes = SelectionGrammar.liveLanes(in: store.snapshot)
+        let lanes = SelectionGrammar.lanes(in: store.snapshot)
         guard let index = lanes.firstIndex(of: head) else { return .handled }
 
         switch (direction, mode) {
@@ -945,30 +945,30 @@ struct BoardView: View {
             let next = index + (direction == .left ? -1 : 1)
             guard lanes.indices.contains(next) else { return .handled }
             if mode == .step {
-                replaceSelection(with: lanes[next], on: .live)
+                replaceSelection(with: lanes[next], in: .board)
             } else {
                 let anchor = store.transient.selectionAnchor ?? head
                 guard let ids = SelectionGrammar.range(
                     from: anchor,
                     to: lanes[next],
                     kind: .lane,
-                    on: .live,
+                    in: .board,
-                    in: store.snapshot
+                    snapshot: store.snapshot
                 ) else { return .handled }
-                store.select(ids, liveness: .live, anchor: anchor, head: lanes[next])
+                store.select(ids, in: .board, anchor: anchor, head: lanes[next])
             }
 
         case (.left, .jump), (.right, .jump):
             guard let target = direction == .left ? lanes.first : lanes.last else { return .handled }
-            replaceSelection(with: target, on: .live)
+            replaceSelection(with: target, in: .board)
 
         case (.down, .step), (.down, .jump):
-            guard let lane = store.snapshot.lanes.first(where: { $0.id == head && !$0.isDeleted }) else {
+            guard let lane = store.snapshot.lanes.first(where: { $0.id == head }) else {
                 return .handled
             }
-            let cards = lane.cards.filter { !$0.isDeleted }
+            let cards = lane.cards
             guard let target = mode == .jump ? cards.last : cards.first else { return .handled }
-            replaceSelection(with: target.id, on: .live)
+            replaceSelection(with: target.id, in: .board)
 
         case (.up, _), (.down, .extend):
             // Nothing above the lane domain, and no vertical range within it.
@@ -980,8 +980,8 @@ struct BoardView: View {
     // MARK: Shared
 
     /// A jump's and a plain step's shared landing: one item, both cursors on it.
-    private func replaceSelection(with id: ItemID, on side: Liveness) {
+    private func replaceSelection(with id: ItemID, in container: ItemContainer) {
-        store.select([id], liveness: side, anchor: id, head: id)
+        store.select([id], in: container, anchor: id, head: id)
     }
 
     /// The first rendered card of the first lane that has one — the scan every "first/last lane"
@@ -994,7 +994,7 @@ struct BoardView: View {
         filter: SearchFilter = .inactive
     ) -> ItemID? {
         for lane in lanes {
-            if let card = lane.cards.first(where: { !$0.isDeleted && filter.matches($0) }) { return card.id }
+            if let card = lane.cards.first(where: { filter.matches($0) }) { return card.id }
         }
         return nil
     }

Kanban/UI/Board/DragPayload.swift

@@ -46,20 +46,6 @@ enum DragKind: String, Codable, Sendable, Equatable {
 /// stray drop into a text editor does something sane rather than nothing.
 struct DragPayload: Codable, Sendable, Equatable {
 
-    /// Which side of the live/tombstoned boundary the drag started on — a trash row's drag is a card
-    /// drag from the trashed side, and 04-interactions.md ▸ The trash gives it its own rules
-    /// (restore within the board, copy-out across boards).
-    enum Side: String, Codable, Sendable, Equatable {
-        case live
-        case trashed
-
-        init(_ liveness: Liveness) {
-            self = liveness == .live ? .live : .trashed
-        }
-
-        var liveness: Liveness { self == .live ? .live : .trashed }
-    }
-
     /// One dragged item: its UUID, its folder on disk, and its title for the text representation.
     struct Item: Codable, Sendable, Equatable {
         var id: String
@@ -71,7 +57,11 @@ struct DragPayload: Codable, Sendable, Equatable {
     var boardRoot: String
 
     var kind: DragKind
-    var side: Side
+
+    /// Which container the drag started in — a trash card's drag is a card drag from `.trash`, which
+    /// is the whole of what makes its within-board drop a restore (04-interactions.md ▸ The trash).
+    /// `ItemContainer` is `String`-backed and `Codable` precisely so it can ride a pasteboard.
+    var container: ItemContainer
 
     /// The dragged items **in flatten order** — "lane `order` first, then card `order`"
     /// (04-interactions.md ▸ Drag and drop). The drop commits trust this order rather than
@@ -97,10 +87,10 @@ struct DragPayload: Codable, Sendable, Equatable {
         try? JSONEncoder().encode(self)
     }
 
-    init(boardRoot: URL, kind: DragKind, side: Liveness, items: [Item]) {
+    init(boardRoot: URL, kind: DragKind, container: ItemContainer, items: [Item]) {
         self.boardRoot = boardRoot.path
         self.kind = kind
-        self.side = Side(side)
+        self.container = container
         self.items = items
     }
 

Kanban/UI/Board/DragSession.swift

@@ -15,16 +15,17 @@ struct DropTarget: Equatable, Sendable {
     /// The three surfaces a drop can name, spelled as a sum so the impossible combinations cannot be
     /// written down at all.
     ///
-    /// The trash is a case rather than an id because **it has no id**: the quasi-lane is not in the
+    /// The trash is a case rather than an id because **it has no id**: `.trash/` "holds card
-    /// snapshot — it is `TrashModel.entries` derived from it — so there is nothing to put in a
+    /// folders directly — same shape as a lane's children, no `index.md` of its own"
-    /// `lane`, and its index is not a position the pointer chose either (see `TrashDrop`).
+    /// (01-storage-format.md § Deletion), so there is nothing to put in a `lane`, and its index is
+    /// not a position the pointer chose either (see `TrashDrop`).
     enum Container: Equatable, Sendable {
-        /// The **lane strip**: the index counts live lanes with the dragged run removed.
+        /// The **lane strip**: the index counts the board's lanes with the dragged run removed.
         case strip
         /// That lane's **masonry**: the index is a position in its logical card order
         /// (DRAG-REORDER.md § The card masonry).
         case lane(ItemID)
-        /// The **trash quasi-lane**, which a live card drag proposes into to delete it
+        /// The **trash column**, which a board card drag proposes into to delete it
         /// (04-interactions.md ▸ The trash, settled 2026-07-28). The index is always the topmost row.
         case trash
     }
@@ -57,8 +58,9 @@ enum TrashDrop {
 
     /// The row the shadow takes, always: **the topmost**.
     ///
-    /// Not arbitrary, and the sort is what makes it honest: the trash orders by `deleted`
+    /// Not arbitrary, and the ranks are what make it honest: "every trash arrival mints a rank
-    /// newest-first (03-board-ui.md § Trash), so a fresh tombstone genuinely lands on top. The drop
+    /// above the current top" (04-interactions.md ▸ The trash), so a fresh delete genuinely lands on
+    /// top. The drop
     /// therefore still lands exactly where the shadow shows — the one positional promise every other
     /// drop in this app makes — while being the only proposal on the board the *pointer* does not
     /// choose.
@@ -70,7 +72,7 @@ enum TrashDrop {
     /// - **Lanes are not deliverable this way** — "a lane drag proposes only lane slots". (The strip's
     ///   slot list has never contained the quasi-lane, so this is belt over braces; it is written down
     ///   because a guard that is only true by construction is one refactor from being false.)
-    /// - **A trash row is already there.** A `.trashed` session's vocabulary is restore and copy-out;
+    /// - **A trash card is already there.** A `.trash` session's vocabulary is restore and copy-out;
     ///   dropping it back where it came from writes nothing.
     /// - **Cross-board is refused.** "No move or paste ever targets the trash": a foreign card
     ///   delivered *into* this board's trash would be a transfer-and-delete compound, an operation the
@@ -82,14 +84,14 @@ enum TrashDrop {
     /// - **The mutating-gesture rule**, like every other write the pointer can start.
     static func accepts(
         kind: DragKind?,
-        side: Liveness,
+        container: ItemContainer,
         isWithinBoard: Bool,
         operation: TransferOperation,
         isTrashShown: Bool,
         acceptsMutations: Bool
     ) -> Bool {
         guard isTrashShown, acceptsMutations else { return false }
-        guard kind == .cards, side == .live, isWithinBoard else { return false }
+        guard kind == .cards, container == .board, isWithinBoard else { return false }
         return operation == .move
     }
 }
@@ -207,14 +209,14 @@ enum DragLocality {
     /// - **Lane drags never copy within their board.** ⌥ is simply ignored there: the drag stays a
     ///   clean reorder and the badge never shows copy. The within-board lane duplicate exists, but
     ///   its home is the clipboard (▸ Clipboard, Lane paste).
-    /// - **A trash row's drag is copy-out grammar** (▸ The trash). Within its own board it is the
+    /// - **A trash card's drag is the restore** (▸ The trash). Within its own board it is "an
-    ///   restore — a move, no badge; across boards the default is the live copy that leaves the
+    ///   ordinary move to the drop position"; across boards the default is the copy that leaves the
-    ///   tombstoned original in place, exactly as ⌘C out of the trash behaves. ⌘ forces the true
+    ///   original in the source trash, and "⌘-drag forces the true cross-board restore-move". Both
-    ///   restore-move either way, and ⌥ forces the live copy either way ("⌘C, ⌥-drag, and the
+    ///   fall out of the ordinary locality rule with no trash clause at all, which is the pivot's
-    ///   cross-board drag default always yield *live* copies").
+    ///   whole point.
     static func operation(
         kind: DragKind,
-        side: Liveness,
+        container: ItemContainer,
         isWithinBoard: Bool,
         modifiers: NSEvent.ModifierFlags
     ) -> TransferOperation {
@@ -227,7 +229,7 @@ enum DragLocality {
 
         if forcesMove { return .move }
         if forcesCopy { return .copy }
-        _ = side   // the side changes which commit runs, never which operation the badge shows
+        _ = container   // the container changes which commit runs, never which operation the badge shows
         return isWithinBoard ? .move : .copy
     }
 }
@@ -272,9 +274,9 @@ final class DragSession {
     /// means here rather than a separate flag.
     private(set) var kind: DragKind?
 
-    /// The side the drag started on. A trash row's drag is a `.cards` session on the `.trashed`
+    /// The container the drag started in. A trash card's drag is a `.cards` session in `.trash`,
-    /// side, and that is the whole of what makes it one (04-interactions.md ▸ The trash).
+    /// and that is the whole of what makes it a restore (04-interactions.md ▸ The trash).
-    private(set) var side: Liveness = .live
+    private(set) var container: ItemContainer = .board
 
     /// The dragged items in **flatten order** — the order they will land in.
     private(set) var members: [ItemID] = []
@@ -358,8 +360,8 @@ final class DragSession {
 
     /// The items to **leave out of the resting layout** on the board rooted at `root`.
     ///
-    /// Only the source board hides anything, and only for a live-side session: a trash row's drag
+    /// Only the source board hides anything, and only for a board-side session: a trash card's drag
-    /// carries items that render in the quasi-lane, not in any lane's masonry, so no lane loses a
+    /// carries items that render in the trash column, not in any lane's masonry, so no lane loses a
     /// card to it.
     ///
     /// **The dragged run is lifted out whatever the effective operation is** (DRAG-REORDER.md §
@@ -368,7 +370,7 @@ final class DragSession {
     /// originals reappear when the write lands — the hold keeps them lifted for that round trip, so
     /// the arrangement on screen is the one the release proposed and stays still until the echo.
     func hiddenMembers(onBoardRooted root: URL) -> Set<ItemID> {
-        guard isActive, side == .live, let sourceRoot,
+        guard isActive, container == .board, let sourceRoot,
               DragLocality.isSameBoard(root, sourceRoot)
         else { return [] }
         return memberSet
@@ -473,27 +475,27 @@ final class DragSession {
 
     // MARK: Lifecycle
 
-    /// Begins a card session — live faces or trash rows.
+    /// Begins a card session — board faces or trash cards.
     ///
     /// - Parameters:
-    ///   - members: the dragged cards in flatten order (`SelectionGrammar.liveCards`, or the trash's
+    ///   - members: the dragged cards in flatten order (`SelectionGrammar.boardCards`, or the
-    ///     own sorted order for a trash-row drag).
+    ///     trash's own order for a trash-card drag).
     ///   - heights: their measured heights, captured **before** the pickup transition starts.
     func beginCards(
         _ members: [ItemID],
         folders: [URL],
         heights: [CGFloat],
-        side: Liveness,
+        container: ItemContainer,
         source: BoardStore
     ) {
-        begin(kind: .cards, members: members, folders: folders, side: side, source: source)
+        begin(kind: .cards, members: members, folders: folders, container: container, source: source)
         cardHeights = heights
         laneUnits = []
     }
 
     /// Begins a lane session.
     func beginLanes(_ members: [ItemID], folders: [URL], units: [Int], source: BoardStore) {
-        begin(kind: .lanes, members: members, folders: folders, side: .live, source: source)
+        begin(kind: .lanes, members: members, folders: folders, container: .board, source: source)
         laneUnits = units
         cardHeights = []
     }
@@ -502,7 +504,7 @@ final class DragSession {
         kind: DragKind,
         members: [ItemID],
         folders: [URL],
-        side: Liveness,
+        container: ItemContainer,
         source: BoardStore
     ) {
         endHold()
@@ -510,14 +512,14 @@ final class DragSession {
         self.members = members
         self.memberSet = Set(members)
         self.folders = folders
-        self.side = side
+        self.container = container
         self.sourceStore = source
         self.sourceRoot = source.rootURL
         self.proposal = nil
         self.operation = .move
         // The reload-resolved drag set: vanished members leave it silently, which is what
         // `survivors` reads and what "an emptied drag cancels itself" is stated in terms of.
-        source.transient.dragMembers = ItemReferenceSet(ids: memberSet, liveness: side)
+        source.transient.dragMembers = ItemReferenceSet(ids: memberSet, container: container)
         armWatchdog()
     }
 
@@ -538,7 +540,7 @@ final class DragSession {
         guard let kind, let sourceRoot else { return operation }
         let resolved = DragLocality.operation(
             kind: kind,
-            side: side,
+            container: container,
             isWithinBoard: DragLocality.isSameBoard(sourceRoot, destinationRoot),
             modifiers: NSEvent.modifierFlags
         )

Kanban/UI/Board/LaneView.swift

@@ -126,7 +126,7 @@ struct LaneView: View {
             // the drag off until the pointer actually moves, so a click is never a drag.
             .onTapGesture {
                 store.click(
-                    SelectionTarget(id: lane.id, kind: .lane, side: .live),
+                    SelectionTarget(id: lane.id, kind: .lane, container: .board),
                     modifier: .current,
                     togglesOnRepeat: true
                 )
@@ -232,17 +232,17 @@ struct LaneView: View {
     /// alone — standard macOS context-menu targeting (the pathfinder's `styleSelection`, kept).
     /// Right-clicking something outside the selection acts on what was clicked.
     private var styleTarget: StyleTarget {
-        guard store.selection.liveness == .live, store.selection.ids.contains(lane.id) else {
+        guard store.selection.container == .board, store.selection.ids.contains(lane.id) else {
             return .items([lane.id])
         }
         return .items(store.selection.ids)
     }
 
     /// Delete's target set — the same widening `styleTarget` does, spelled as a plain `Set<ItemID>`
-    /// because `store.delete(_:)` takes one directly (`TrashEntryRow.targetIDs`'s naming, reused here
+    /// because `store.delete(_:)` takes one directly (the context-menu targeting rule, reused here
     /// on the live side).
     private var targetIDs: Set<ItemID> {
-        guard store.selection.liveness == .live, store.selection.ids.contains(lane.id) else {
+        guard store.selection.container == .board, store.selection.ids.contains(lane.id) else {
             return [lane.id]
         }
         return store.selection.ids
@@ -352,20 +352,20 @@ struct LaneView: View {
     private func startLaneDrag() -> NSItemProvider {
         guard !store.isReadOnly, !store.isEditingInline else { return NSItemProvider() }
         let selection = store.selection
-        let ids: Set<ItemID> = selection.liveness == .live
+        let ids: Set<ItemID> = selection.container == .board
             && selection.ids.contains(lane.id)
             && selection.ids.count > 1
             ? selection.ids
             : [lane.id]
 
-        let members = store.snapshot.lanes.filter { !$0.isDeleted && ids.contains($0.id) }
+        let members = store.snapshot.lanes.filter { ids.contains($0.id) }
         guard !members.isEmpty else { return NSItemProvider() }
 
         let root = store.rootURL
         let payload = DragPayload(
             boardRoot: root,
             kind: .lanes,
-            side: .live,
+            container: .board,
             items: members.map {
                 DragPayload.Item(
                     id: $0.id.rawValue,
@@ -405,7 +405,7 @@ struct LaneView: View {
 
     private var draggedLaneCount: Int {
         let selection = store.selection
-        guard selection.liveness == .live, selection.ids.contains(lane.id) else { return 1 }
+        guard selection.container == .board, selection.ids.contains(lane.id) else { return 1 }
         return selection.ids.count
     }
 
@@ -544,7 +544,7 @@ struct LaneView: View {
             // shares (04-interactions.md § Selection), and the modifier grammar on top of it.
             .onTapGesture {
                 store.click(
-                    SelectionTarget(id: lane.id, kind: .lane, side: .live),
+                    SelectionTarget(id: lane.id, kind: .lane, container: .board),
                     modifier: .current,
                     togglesOnRepeat: true
                 )
@@ -552,7 +552,7 @@ struct LaneView: View {
             // The rubber band's first surface — "click-drag rubber-bands across lanes". Simultaneous
             // so the taps above stay instant; the band's own begin guard is what keeps a drag that
             // started on a card face out of it (`MarqueeControl`).
-            .simultaneousGesture(marquee.gesture(side: .live))
+            .simultaneousGesture(marquee.gesture(in: .board))
             // The same menu the header carries — "one menu, invoked on the header or lane empty
             // space alike" (03-board-ui.md § Lane, settled).
             .contextMenu { laneMenu }
@@ -688,7 +688,7 @@ struct LaneView: View {
         renaming: ItemID?
     ) -> [Card] {
         cards.filter { card in
-            guard !card.isDeleted, !hidden.contains(card.id) else { return false }
+            guard !hidden.contains(card.id) else { return false }
             return filter.matches(card) || card.id == renaming
         }
     }
@@ -696,7 +696,7 @@ struct LaneView: View {
     // MARK: - Selection
 
     private var isSelected: Bool {
-        store.selection.liveness == .live && store.selection.ids.contains(lane.id)
+        store.selection.container == .board && store.selection.ids.contains(lane.id)
     }
 
     /// The selection treatment: a subtle whole-lane accent wash and stroke. Deliberately quiet —
@@ -922,7 +922,7 @@ private struct CardFaceView: View {
         // Board ▸ Rename. The modifier grammar — plain replaces, ⌘ toggles, ⇧ ranges — is
         // `SelectionGrammar`'s, reached through the store's one funnel.
         .onTapGesture {
-            store.click(SelectionTarget(id: card.id, kind: .card, side: .live), modifier: .current)
+            store.click(SelectionTarget(id: card.id, kind: .card, container: .board), modifier: .current)
         }
         // "A fast double-click opens the card window (⌘↩'s pointer twin)" (04 ▸ Selection).
         //
@@ -948,7 +948,7 @@ private struct CardFaceView: View {
             drops.registry.update(height: height, for: card.id)
         }
         .onDisappear { drops.registry.removeHeight(card.id) }
-        .marqueeTarget(card.id, kind: .card, side: .live, in: marquee.registry)
+        .marqueeTarget(card.id, kind: .card, container: .board, in: marquee.registry)
         .contextMenu { cardMenu }
         .popover(isPresented: styleEditorPresentation(store, anchor: card.id), arrowEdge: .bottom) {
             StyleEditorPopover(store: store, recents: appModel.styleRecents)
@@ -960,7 +960,7 @@ private struct CardFaceView: View {
     /// Begins the card's system drag session (DRAG-REORDER.md; 04-interactions.md ▸ Drag and drop).
     ///
     /// **Dragging any member of a multi-selection drags the whole selection**, in **flatten order** —
-    /// "lane `order` first, then card `order`", `SelectionGrammar.liveCards`' single definition of
+    /// "lane `order` first, then card `order`", `SelectionGrammar.boardCards`' single definition of
     /// it, which is also the order the drop inserts in. A card outside the selection drags alone.
     ///
     /// Refused under the read-only lock and while an inline editor is focused, like every other
@@ -969,7 +969,7 @@ private struct CardFaceView: View {
         guard !store.isReadOnly, !store.isEditingInline else { return NSItemProvider() }
         let snapshot = store.snapshot
         let selection = store.selection
-        let ids: Set<ItemID> = selection.liveness == .live
+        let ids: Set<ItemID> = selection.container == .board
             && selection.ids.contains(card.id)
             && selection.ids.count > 1
             ? selection.ids
@@ -978,21 +978,21 @@ private struct CardFaceView: View {
         // Flatten order, and the lane each member currently lives in — the folder path's middle
         // component.
         var lanesByCard: [ItemID: ItemID] = [:]
-        var titles: [ItemID: String?] = [:]
+        var titles: [ItemID: String] = [:]
-        for lane in snapshot.lanes where !lane.isDeleted {
+        for lane in snapshot.lanes {
-            for member in lane.cards where !member.isDeleted && ids.contains(member.id) {
+            for member in lane.cards where ids.contains(member.id) {
                 lanesByCard[member.id] = lane.id
                 titles[member.id] = member.title.value
             }
         }
-        let ordered = SelectionGrammar.liveCards(in: snapshot).filter { ids.contains($0) }
+        let ordered = SelectionGrammar.boardCards(in: snapshot).filter { ids.contains($0) }
         guard !ordered.isEmpty else { return NSItemProvider() }
 
         let root = store.rootURL
         let payload = DragPayload(
             boardRoot: root,
             kind: .cards,
-            side: .live,
+            container: .board,
             items: ordered.compactMap { id in
                 guard let laneID = lanesByCard[id] else { return nil }
                 return DragPayload.Item(
@@ -1001,7 +1001,7 @@ private struct CardFaceView: View {
                         .appendingPathComponent(laneID.rawValue, isDirectory: true)
                         .appendingPathComponent(id.rawValue, isDirectory: true)
                         .path,
-                    title: titles[id] ?? nil
+                    title: titles[id]
                 )
             }
         )
@@ -1012,7 +1012,7 @@ private struct CardFaceView: View {
             // replica, and its lingering "last measured frame" would mis-size the shadow and the
             // span-cap (03-board-ui.md § Motion).
             heights: ordered.map { drops.registry.heights[$0] ?? LaneDropRegistry.nominalCardHeight },
-            side: .live,
+            container: .board,
             source: store
         )
         return payload.itemProvider()
@@ -1021,7 +1021,7 @@ private struct CardFaceView: View {
     /// The image travelling under the cursor: this card's face at its real size, fanned with ghosts
     /// and a count badge when the whole multi-selection rides along (03-board-ui.md § Motion).
     private var dragReplica: some View {
-        let count = store.selection.liveness == .live && store.selection.ids.contains(card.id)
+        let count = store.selection.container == .board && store.selection.ids.contains(card.id)
             ? max(1, store.selection.ids.count)
             : 1
         return ZStack {
@@ -1098,17 +1098,17 @@ private struct CardFaceView: View {
     /// alone — standard macOS context-menu targeting, shared by Style… (`styleTarget`) and Delete
     /// (`targetIDs`) alike. Right-clicking something outside the selection acts on what was clicked.
     private var styleTarget: StyleTarget {
-        guard store.selection.liveness == .live, store.selection.ids.contains(card.id) else {
+        guard store.selection.container == .board, store.selection.ids.contains(card.id) else {
             return .items([card.id])
         }
         return .items(store.selection.ids)
     }
 
     /// Delete's target set — the same widening `styleTarget` does, spelled as a plain `Set<ItemID>`
-    /// because `store.delete(_:)` takes one directly (`TrashEntryRow.targetIDs`'s naming, reused here
+    /// because `store.delete(_:)` takes one directly (the context-menu targeting rule, reused here
     /// on the live side).
     private var targetIDs: Set<ItemID> {
-        guard store.selection.liveness == .live, store.selection.ids.contains(card.id) else {
+        guard store.selection.container == .board, store.selection.ids.contains(card.id) else {
             return [card.id]
         }
         return store.selection.ids
@@ -1205,7 +1205,7 @@ private struct CardFaceView: View {
     // MARK: - Selection and rename plumbing
 
     private var isSelected: Bool {
-        store.selection.liveness == .live && store.selection.ids.contains(card.id)
+        store.selection.container == .board && store.selection.ids.contains(card.id)
     }
 
     /// Whether an external Finder file drag is hovering **this** card — the attach highlight
@@ -1330,14 +1330,14 @@ private struct NewCardStubView: View {
     ///
     /// The lane is read before the commit, because every discard path clears the overlay that holds
     /// it — and re-checked after, because one of those paths is *the lane vanished*, and selecting
-    /// something that renders nowhere would break the homogeneous-by-liveness invariant until the
+    /// something that renders nowhere would break the one-container invariant until the
     /// next reload swept it away.
     @discardableResult
     private func commit() -> ItemID? {
         let lane = store.transient.newCardPlaceholder?.laneID
         let id = store.commitPlaceholder()
-        if let lane, store.snapshot.lanes.contains(where: { $0.id == lane && !$0.isDeleted }) {
+        if let lane, store.snapshot.lanes.contains(where: { $0.id == lane }) {
-            store.select([lane], liveness: .live)
+            store.select([lane], in: .board)
         }
         return id
     }

Kanban/UI/Board/MarqueeSession.swift

@@ -30,7 +30,7 @@ final class MarqueeSession {
     private(set) var current: CGPoint = .zero
 
     /// The side of the live/trash boundary this band selects on, frozen at `begin`.
-    private(set) var side: Liveness = .live
+    private(set) var container: ItemContainer = .board
 
     /// How far the pointer must travel before a drag on empty space becomes a band. Larger than the
     /// lane header's threshold because this gesture arms on *any* empty surface, and a click that
@@ -51,10 +51,10 @@ final class MarqueeSession {
         )
     }
 
-    func begin(at point: CGPoint, side: Liveness) {
+    func begin(at point: CGPoint, in container: ItemContainer) {
         origin = point
         current = point
-        self.side = side
+        self.container = container
     }
 
     func update(to point: CGPoint) {
@@ -81,9 +81,9 @@ final class MarqueeSession {
 /// is on screen. It is also what makes the band correct for free across a lane resize, a reorder in
 /// flight, and a foreign reload — the frames simply re-register.
 ///
-/// **Lanes are never registered.** The band selects cards, and trash rows on the trash side; a lane
+/// **Lanes are never registered.** The band selects cards — board cards or trash cards; a lane has
-/// has no entry here at all, which is 04-interactions.md § Selection's "click-drag rubber-bands
+/// no entry here at all, which is 04-interactions.md § Selection's "click-drag rubber-bands across
-/// across lanes" made structural rather than filtered.
+/// lanes" made structural rather than filtered.
 ///
 /// It is also the **begin guard's** universe: a drag that starts inside a registered frame belongs
 /// to that item's own gesture (a card drag, a drag out of the trash), never to the band. Deciding

Kanban/UI/Board/NewCardTarget.swift

@@ -41,7 +41,7 @@ enum NewCardTarget {
     /// the two can never disagree.
     ///
     /// - Parameters:
-    ///   - selection: the board's current selection, liveness side included. A `.trashed` selection
+    ///   - selection: the board's current selection, container included. A `.trash` selection
     ///     "never anchors creation" and is treated exactly as an empty one — the settled precedent
     ///     04 ▸ Clipboard cites for paste, applied here to its source rule ("a trashed card's live
     ///     disk-lane never leaks in as 'the selected card's lane'").
@@ -53,7 +53,7 @@ enum NewCardTarget {
         lastActiveLaneID: ItemID?,
         snapshot: BoardModel
     ) -> Resolution? {
-        let lanes = snapshot.lanes.filter { !$0.isDeleted }
+        let lanes = snapshot.lanes
         guard !lanes.isEmpty else { return nil }
 
         if let anchor = flattenAnchor(selection: selection, snapshot: snapshot) {
@@ -86,21 +86,21 @@ enum NewCardTarget {
     /// which falls out of never looking at the trashed side at all), and a stale one whose ids name
     /// nothing the board renders.
     static func flattenAnchor(selection: ItemReferenceSet, snapshot: BoardModel) -> Resolution? {
-        guard selection.liveness == .live, !selection.ids.isEmpty else { return nil }
+        guard selection.container == .board, !selection.ids.isEmpty else { return nil }
 
         // The snapshot's lanes and cards are already in display order, so the flatten order is one
         // walk, and the *last* hit is the anchor. Selection is homogeneous (cards XOR lanes), so only
         // one of the two branches ever fires within a walk; a sole selection is simply the degenerate
         // one-member case of the same rule.
         var anchor: Resolution?
-        for lane in snapshot.lanes where !lane.isDeleted {
+        for lane in snapshot.lanes {
             // A selected lane: creation appends at its bottom, Return consistency; paste lands after
             // the lane itself.
             if selection.ids.contains(lane.id) {
                 anchor = Resolution(laneID: lane.id, anchorCardID: nil)
             }
             // A selected card: its lane, immediately after it — paste-anchor consistency.
-            for card in lane.cards where !card.isDeleted && selection.ids.contains(card.id) {
+            for card in lane.cards where selection.ids.contains(card.id) {
                 anchor = Resolution(laneID: lane.id, anchorCardID: card.id)
             }
         }

Kanban/UI/Board/PasteTarget.swift

@@ -50,10 +50,10 @@ enum PasteTarget {
             lastActiveLaneID: lastActiveLaneID,
             snapshot: snapshot
         ),
-            let lane = snapshot.lanes.first(where: { $0.id == resolution.laneID && !$0.isDeleted })
+            let lane = snapshot.lanes.first(where: { $0.id == resolution.laneID })
         else { return nil }
 
-        let rendered = lane.cards.filter { !$0.isDeleted }
+        let rendered = lane.cards
         // `insertionIndex` answers `nil` for "append", which is `rendered.count` — the same position
         // said two ways, and the creation path's own degradation for an anchor that has since gone.
         let index = BoardStore.insertionIndex(after: resolution.anchorCardID, among: rendered) ?? rendered.count
@@ -64,7 +64,7 @@ enum PasteTarget {
     /// included, because lane paste "stays enabled and lands at the board's right end" whatever the
     /// board holds. That is what makes it the other way out of a board with no lanes.
     static func lanes(selection: ItemReferenceSet, snapshot: BoardModel) -> Int {
-        let lanes = snapshot.lanes.filter { !$0.isDeleted }
+        let lanes = snapshot.lanes
         guard let anchor = NewCardTarget.flattenAnchor(selection: selection, snapshot: snapshot),
               let position = lanes.firstIndex(where: { $0.id == anchor.laneID })
         else {

Kanban/UI/Board/SelectionClicks.swift

@@ -47,24 +47,25 @@ struct MarqueeControl {
     ///   loop simply keeps declining for the rest of that drag. Deciding this by frames rather than
     ///   by gesture priority is what keeps the two from fighting, and it stays correct as the
     ///   masonry reflows.
-    /// - **The side is fixed at the origin** — 04-interactions.md ▸ The trash's rule, stored in the
+    /// - **The container is fixed at the origin** — 04-interactions.md ▸ The trash's rule ("the
-    ///   session so a band dragged across the boundary keeps its meaning.
+    ///   rubber band stays on the side it started on"), stored in the session so a band dragged
+    ///   across the boundary keeps its meaning.
     /// - **Live-updating, not commit-on-release**: each sample recomputes the whole set from the
     ///   band, so the selection follows the cursor both ways. An empty band clears rather than
     ///   leaving the last non-empty one standing.
     /// - **Alive under the read-only lock**: selection is not a mutation (02-architecture.md § The
     ///   lock's scope), and no `isEditingInline` guard either — a click-away mid-rename already
     ///   commits through the field's own focus loss.
-    func gesture(side: Liveness) -> some Gesture {
+    func gesture(in container: ItemContainer) -> some Gesture {
         DragGesture(minimumDistance: MarqueeSession.minimumDistance, coordinateSpace: .named(BoardView.stripSpace))
             .onChanged { value in
                 if !session.isActive {
                     guard !registry.contains(value.startLocation) else { return }
-                    session.begin(at: value.startLocation, side: side)
+                    session.begin(at: value.startLocation, in: container)
                 }
                 session.update(to: value.location)
                 guard let rect = session.rect else { return }
-                let ids = MarqueeMath.selection(rect: rect, targets: registry.all, side: session.side)
+                let ids = MarqueeMath.selection(rect: rect, targets: registry.all, in: session.container)
                 if ids.isEmpty {
                     store.clearSelection()
                 } else {
@@ -74,7 +75,7 @@ struct MarqueeControl {
                     // Both are spelled out rather than defaulted, because `select`'s sole-member
                     // default would otherwise pick one up the moment a band happened to sweep
                     // exactly one card.
-                    store.select(ids, liveness: session.side, anchor: nil, head: nil)
+                    store.select(ids, in: session.container, anchor: nil, head: nil)
                 }
             }
             .onEnded { _ in session.end() }
@@ -111,7 +112,7 @@ extension View {
     func marqueeTarget(
         _ id: ItemID,
         kind: SelectionKind,
-        side: Liveness,
+        container: ItemContainer,
         in registry: MarqueeTargetRegistry
     ) -> some View {
         // The space name is read here, on the main actor, rather than inside the measuring closure:
@@ -120,7 +121,7 @@ extension View {
         return onGeometryChange(for: CGRect.self) { proxy in
             proxy.frame(in: .named(space))
         } action: { frame in
-            registry.update(MarqueeTarget(id: id, kind: kind, side: side, frame: frame))
+            registry.update(MarqueeTarget(id: id, kind: kind, container: container, frame: frame))
         }
         .onDisappear { registry.remove(id) }
     }

Kanban/UI/Board/TrashCommands.swift

@@ -21,8 +21,8 @@ final class TrashConfirmations {
     /// The **phrasing is captured when the request is made**, not recomputed at render time: the
     /// user is being asked about the trash as it was when they invoked the command, and a foreign
     /// reload landing mid-alert must not silently change the sentence they are reading. The *action*
-    /// re-resolves against the current snapshot when it runs, so a confirmed purge never acts on an
+    /// re-resolves against the current snapshot when it runs, so a confirmed purge never acts on a
-    /// item that has since gone — `BoardWriter.purgeItem` treats an absent folder as success.
+    /// card that has since gone — the writer treats an absent folder as success.
     private(set) var pending: Pending?
 
     struct Pending: Identifiable, Equatable {
@@ -30,20 +30,46 @@ final class TrashConfirmations {
         let prompt: TrashModel.PurgePrompt
         let action: Action
 
-        /// What the confirmation is standing in front of. Two cases, because the two commands have
+        /// What the confirmation is standing in front of. Three cases, because the three commands
-        /// genuinely different scopes: one names a selection, the other names the whole trash and
+        /// have genuinely different scopes and two different writes: the trash's own staged Delete,
-        /// re-derives its targets at the moment it runs.
+        /// Delete Immediately (which skips the trash from either container), and Empty Trash (which
+        /// names the whole container and re-derives its targets at the moment it runs).
         enum Action: Equatable {
+            case deleteTrashCards(Set<ItemID>)
             case purge(Set<ItemID>)
             case emptyTrash
         }
     }
 
+    /// **File ▸ Delete, staged by place** (04-interactions.md ▸ The map) — with the confirmation the
+    /// trash side owes and the board side does not.
+    ///
+    /// A board selection goes straight through: moving a card into the trash and deleting a lane are
+    /// both recoverable (the trash itself, and native undo — 03-board-ui.md § Trash), so neither
+    /// stands an alert. A **trash** selection is the permanent one, and it "confirms exactly where
+    /// the loss is real": `purgeIsUnrecoverable` decides, exactly as it does for Delete Immediately.
+    ///
+    /// The staging itself lives on the store (`BoardStore.deleteSelection`), so this is the alert and
+    /// nothing else — the two can never disagree about which write a ⌘⌫ performs.
+    func requestDelete(in store: BoardStore) {
+        guard store.selection.container == .trash, store.purgeIsUnrecoverable else {
+            store.deleteSelection()
+            return
+        }
+        guard let prompt = TrashModel.purgePrompt(
+            for: store.selection.ids,
+            in: .trash,
+            snapshot: store.snapshot,
+            unrecoverable: true
+        ) else { return }
+        pending = Pending(prompt: prompt, action: .deleteTrashCards(store.selection.ids))
+    }
+
     /// Raises Delete Immediately's alert — **or purges outright** where the loss is not real.
     ///
     /// The mode check is the one thing that decides between the two, and it lives on the store as a
     /// named predicate (`BoardStore.purgeIsUnrecoverable`) so the git milestone changes one
-    /// expression rather than two call sites.
+    /// expression rather than three call sites.
     func requestPurge(of ids: Set<ItemID>, in store: BoardStore) {
         guard store.purgeIsUnrecoverable else {
             store.deleteImmediately(ids)
@@ -51,7 +77,8 @@ final class TrashConfirmations {
         }
         guard let prompt = TrashModel.purgePrompt(
             for: ids,
-            in: store.snapshot,
+            in: store.selection.container,
+            snapshot: store.snapshot,
             unrecoverable: true
         ) else { return }
         pending = Pending(prompt: prompt, action: .purge(ids))
@@ -73,6 +100,7 @@ final class TrashConfirmations {
         guard let pending else { return }
         self.pending = nil
         switch pending.action {
+        case let .deleteTrashCards(ids): store.deleteTrashCards(ids)
         case let .purge(ids): store.deleteImmediately(ids)
         case .emptyTrash: store.emptyTrash()
         }
@@ -96,22 +124,17 @@ extension FocusedValues {
     }
 }
 
-// MARK: - File ▸ Delete / Put Back / Delete Immediately / Empty Trash…
+// MARK: - File ▸ Delete / Delete Immediately / Empty Trash…
 
 /// The File menu's trash rows (11-command-nexus.md).
 ///
-/// ### The ⌘⌫ chord twins
+/// ### One Delete, staged by place
 ///
-/// Delete and Put Back are **two items sharing one key equivalent**, and validation enables exactly
+/// **Put Back is retired with the tombstone model** (04-interactions.md ▸ The map, resettled
-/// one of them: "AppKit routes a shared key equivalent to the enabled item" (04-interactions.md ▸
+/// 2026-07-28): "File ▸ Delete is the chord's only owner — no twin menu items, no shared-equivalent
-/// The map, which names Finder's own Move to Trash/Put Back pair as the precedent). The two
+/// routing". The ⌘⌫ chord therefore has exactly one owner, its validation is one predicate
-/// predicates are mirror images over the selection's liveness side
+/// (`TrashModel.canDelete`), and which write it performs is decided by the selection's *container*
-/// (`TrashModel.canDelete`/`canActOnTrash`), so they can neither both enable nor both disable while
+/// inside the store rather than by AppKit picking whichever of two items happened to be enabled.
-/// something is selected — and a selection can never be mixed, because
-/// `ItemReferenceSet.resolved(against:)` treats a liveness flip as a vanish.
-///
-/// **Both titles stay stable** (titles-are-API): each remaps independently through the system
-/// mechanism, and remapping one never moves the other's role.
 struct TrashCommands: View {
 
     @FocusedValue(\.boardStore) private var store
@@ -119,24 +142,18 @@ struct TrashCommands: View {
 
     var body: some View {
         Button("Delete") {
-            store?.deleteSelection()
+            guard let store, let confirmations else { return }
+            confirmations.requestDelete(in: store)
         }
         .keyboardShortcut(.delete, modifiers: .command)
-        .disabled(!canDelete)
+        .disabled(!canDelete || confirmations == nil)
-
-        Button("Put Back") {
-            guard let store else { return }
-            store.putBack(store.selection.ids)
-        }
-        .keyboardShortcut(.delete, modifiers: .command)
-        .disabled(!canActOnTrash)
 
         Button("Delete Immediately") {
             guard let store, let confirmations else { return }
             confirmations.requestPurge(of: store.selection.ids, in: store)
         }
         .keyboardShortcut(.delete, modifiers: [.option, .command])
-        .disabled(!canActOnTrash || confirmations == nil)
+        .disabled(!canDeleteImmediately || confirmations == nil)
 
         Button("Empty Trash…") {
             guard let store, let confirmations else { return }
@@ -146,29 +163,29 @@ struct TrashCommands: View {
         .disabled(!canEmptyTrash)
     }
 
-    /// A live, non-empty selection on a board that accepts writes.
+    /// A non-empty selection that still names something, on a board that accepts writes — both
+    /// stagings at once, which is what having one item means.
     private var canDelete: Bool {
         guard let store, store.acceptsBoardMutations else { return false }
         return TrashModel.canDelete(selection: store.selection, in: store.snapshot)
     }
 
-    /// A tombstoned, non-empty selection — Put Back's condition and Delete Immediately's alike, the
+    /// A **card** selection, in either container — "skips the trash from anywhere"
-    /// two being the trash side's pair (04-interactions.md ▸ The trash: "menu validation stays
+    /// (11-command-nexus.md).
-    /// binary").
+    private var canDeleteImmediately: Bool {
-    private var canActOnTrash: Bool {
         guard let store, store.acceptsBoardMutations else { return false }
-        return TrashModel.canActOnTrash(selection: store.selection, in: store.snapshot)
+        return TrashModel.canDeleteImmediately(selection: store.selection, in: store.snapshot)
     }
 
     /// **Trash shown and non-empty** (11-command-nexus.md's own scope for this row) — where
-    /// "non-empty" reads the *board's* tombstones and never the filtered view (03-board-ui.md §
+    /// "non-empty" reads `.trash/` itself and never the filtered view (03-board-ui.md § Trash: "menu
-    /// Trash: "a bulk command about the trash itself never silently narrows to the visible subset").
+    /// validation's non-empty reads `.trash/`, not the filtered view").
     ///
-    /// The visibility clause is 04-interactions.md's, stated for the whole quasi-lane: "hidden, it is
+    /// The visibility clause is 04-interactions.md's, stated for the whole column: "hidden, it is
     /// invisible to every gesture".
     private var canEmptyTrash: Bool {
         guard let store, store.acceptsBoardMutations, store.transient.isTrashVisible else { return false }
-        return !TrashModel.isEmpty(store.snapshot)
+        return !store.snapshot.trash.isEmpty
     }
 }
 
@@ -197,12 +214,10 @@ struct ShowTrashCommand: View {
 
     /// The toggle's binding — and the one place hiding the trash has a consequence beyond layout.
     ///
-    /// **Hiding drops a tombstoned selection.** The rows it pointed at are no longer on screen, and
+    /// **Hiding drops a trash selection** (04-interactions.md ▸ The trash: "hiding it clears a
-    /// "nothing invisible may stay selected" is the invariant every item-referencing set in this app
+    /// selection of trash cards — nothing invisible stays selected, so the toggle-off drops the
-    /// already obeys (`ItemReferenceSet`); leaving one behind would also leave Put Back and Delete
+    /// selection rather than leave commands enabled against rows nobody can see"). A *board*
-    /// Immediately enabled against a trash the user cannot see, which 04-interactions.md rules out
+    /// selection is untouched — the board it names is still right there.
-    /// outright ("hidden, it is invisible to every gesture"). A *live* selection is untouched — the
-    /// board it names is still right there.
     ///
     /// The setter's body lives on the store (`BoardStore.setTrashVisible`) because the toolbar's
     /// Show Trash item is this same command with a different face (03-board-ui.md ▸ Toolbar: "toggle
@@ -237,7 +252,7 @@ extension BoardStore {
             // very animation, and a selection that cleared outside it would be the highlight easing
             // on its own — which 03 § Motion rules out ("the selection highlight rides whatever
             // transaction is active").
-            if !shown, selection.liveness == .trashed {
+            if !shown, selection.container == .trash {
                 clearSelection()
             }
         }

Kanban/UI/Board/TrashLaneView.swift

@@ -4,63 +4,55 @@ import SwiftUI
 
 // MARK: - TrashLaneView
 
-/// The trash quasi-lane: the trailing, visually distinct column tombstoned items live in
+/// The trash column: the trailing, visually distinct column the board's `.trash/` cards live in
-/// (03-board-ui.md § Trash).
+/// (03-board-ui.md § Trash, resettled 2026-07-28 — the materialized trash).
 ///
-/// ### A pure view, and a quasi-lane
+/// ### A rendering of `snapshot.trash`, and a quasi-lane
 ///
-/// **Nothing here moves anything on disk.** Tombstoned items keep their `deleted:` key and stay
+/// **Its contents are ordinary cards in a special place**, so there is nothing to derive: the column
-/// exactly where they are; this column is a rendering of `TrashModel.entries(of:)` and nothing more.
+/// renders `store.snapshot.trash`, which the loader parsed with the same card parse the lanes use
-/// It is a *quasi*-lane because it wears a lane's shape while sharing none of a lane's machinery:
+/// and sorted by `order` like any lane's children. Newest-first falls out of the ranks (every
+/// arrival mints one above the current top), so there is no timestamp sort and no entry type here at
+/// all. It is a *quasi*-lane because it wears a lane's shape while sharing none of a lane's
+/// machinery:
 ///
 /// - it spans a **fixed one width unit** — no `width` frontmatter, no stepper, no resize handle, and
 ///   the edge drag never reaches it (`LaneLayoutMath.totalUnits(of:trashUnits:)` supplies the unit,
 ///   so there is no `Lane` value for any of those to act on);
 /// - it is **not draggable and not reorderable** — the header carries no gesture, and it is absent
 ///   from the drop proposal's slot list by construction, since `BoardView` builds that from the
-///   snapshot's live lanes;
+///   snapshot's lanes;
-/// - it is **no destination for a move** — "no move or paste ever targets the trash"
-///   (04-interactions.md ▸ The trash). It is a destination for exactly one thing, below;
 /// - it has **no new-card button**: nothing is created in the trash.
 ///
-/// ### The one drop it takes: the delete gesture
+/// ### The drop it takes, and the drag it starts
 ///
-/// **"Dropping a live card on the shown trash deletes it"** (04-interactions.md ▸ The trash, settled
+/// **"Dropping a live card on the shown trash deletes it"** (04-interactions.md ▸ The trash) — the
-/// 2026-07-28) — "the drag becomes the pointer's delete gesture; release tombstones the dragged
+/// drag becomes the pointer's delete gesture, and release moves the dragged card(s) into `.trash/`.
-/// card(s), exactly the ⌫ tombstone". So the column does declare an `onDrop`
+/// So the column declares an `onDrop` (`TrashDropDelegate`), and it is the narrowest one on the
-/// (`TrashDropDelegate`), and it is the narrowest one on the board: a **live** card drag from **this**
+/// board: a board card drag from **this** board, unmodified. It diverges from every other drop in one
-/// board, unmodified. Lanes are not deliverable this way, a foreign board's card is not (that would
+/// way, and the ranks are what make the divergence honest: **the shadow always takes the topmost
-/// be a transfer-and-delete compound), ⌥ is not (copying into the trash is not a thing), and hidden
+/// row**, because every arrival mints a rank above the current top.
-/// the column is not rendered at all, so it has no region to enter. Every one of those refusals hands
-/// the session back to the strip's own logic, which is exactly what happened here before this target
-/// existed — so nothing about the column's behaviour changed except the gesture that is new
-/// (`TrashDrop`).
 ///
-/// It diverges from every other drop on the board in one way, and the sort is what makes the
+/// The drag *out* is the restore, and it is deliberately not special: a trash card's drag is an
-/// divergence honest: **the shadow always takes the topmost row**, because the trash orders by
+/// ordinary `.cards` session in the `.trash` container, and `BoardDropContext.commitDrop` hands it
-/// `deleted` newest-first and a fresh tombstone genuinely lands on top. The drop still lands exactly
+/// to the same `moveCards`/`copyCards`/`receiveCards` every board card uses. "Restoring is an
-/// where the shadow shows.
+/// ordinary move out … there is no restore-specific machinery and no Put Back" (03 § Trash).
 ///
-/// **Finder file drops stay inert** — "attachment import on tombstoned cards is inert" (▸ The trash)
+/// **Finder file drops stay inert** — "Finder file drops on trash cards are inert" (▸ The trash) —
-/// — and now say so directly: the delegate clears the file highlight over the column rather than
+/// and say so directly: the delegate clears the file highlight over the column.
-/// relying on the strip resolving to no lane.
 ///
 /// ### No editing in the trash
 ///
-/// "Tombstoned cards don't open — double-click does nothing beyond selection; Put Back or drag out
+/// "No editing in the trash: trash cards don't open — double-click stops at selection; move it out
-/// first." There is deliberately no double-tap recogniser, no rename editor, and no Style… row: the
+/// first." There is deliberately no double-tap recogniser, no rename editor, and no Style… row.
-/// trash is for restoring or purging, not working.
 ///
-/// ### What is still a later card's
+/// ### What is still phase 3's
 ///
-/// **⌘C copy-out** is still owed. The **search filter** ("shown, it participates in the filter like
+/// The column renders the materialized trash correctly and its selection, drag, drop, filter and
-/// any lane") arrived with m5 and is one line — see `entries`, which every other surface here reads
+/// context menu all speak the new container vocabulary — but its *visual* treatment is still the
-/// through. The *pointer* grammar is here: a row's click runs the same `SelectionGrammar` the
+/// tombstone era's compact dimmed plate rather than the card face 03 now implies ("a trashed card is
-/// board does, and the column's empty space rubber-bands on the trashed side. So is the drop, with
+/// an ordinary card in a special place"). Reworking the plate into the ordinary face, and the
-/// the target lane highlighted and the source row dimmed in place; the drag's replica is not. The
+/// accessibility labelling 10-accessibility.md asks for, is the trash's own phase-3 card.
-/// **keyboard** reaches the column entirely through the frames the rows register — arrow walks in
-/// and out, ⇧-arrows inert at both the liveness and the kind boundary — so nothing in this file
-/// implements it beyond keeping every row drawn and registered (see `rows`).
 struct TrashLaneView: View {
 
     let store: BoardStore
@@ -71,13 +63,13 @@ struct TrashLaneView: View {
     /// does.
     let confirmations: TrashConfirmations
 
-    /// The board window's drop machinery — a row's drag is an ordinary card session on the
+    /// The board window's drop machinery — a card's drag is an ordinary card session in the
-    /// **trashed** side (`DragSession`, 04-interactions.md ▸ The trash).
+    /// **trash** container (`DragSession`, 04-interactions.md ▸ The trash).
     let drops: BoardDropContext
 
-    /// The strip's rubber band. The column's empty space is its third surface, on the **trashed**
+    /// The strip's rubber band. The column's empty space is its third surface, in the **trash**
-    /// side — "a rubber-band stays on the side of the boundary it started on" (04-interactions.md ▸
+    /// container — "the rubber band stays on the side it started on" (04-interactions.md ▸ The
-    /// The trash) — and every row registers its frame into the same registry.
+    /// trash) — and every row registers its frame into the same registry.
     let marquee: MarqueeControl
 
     /// Reduce Motion, for the row transition below — 10-accessibility.md names the trash
@@ -91,9 +83,9 @@ struct TrashLaneView: View {
     private let rowSpacing: CGFloat = 6
 
     /// The height a shadow row holds open. A trash row's height is content-driven (one or two title
-    /// lines, plus a lane entry's count line) and the cards being proposed have no row yet to be
+    /// lines) and the cards being proposed have no row yet to be measured, so the shadow is drawn at
-    /// measured, so the shadow is drawn at the nominal single-line plate — `LaneDropRegistry`'s own
+    /// the nominal single-line plate — `LaneDropRegistry`'s own answer to the same question, in this
-    /// answer to the same question, in this column's smaller idiom.
+    /// column's smaller idiom.
     private let nominalRowHeight: CGFloat = 32
 
     var body: some View {
@@ -113,16 +105,16 @@ struct TrashLaneView: View {
         .onDrop(of: boardDropTypes, delegate: TrashDropDelegate(context: drops))
     }
 
-    /// The rows the column shows.
+    /// The cards the column shows.
     ///
-    /// **The shown trash "participates in the filter like any lane"** (03-board-ui.md § Trash), so
+    /// **Shown, the trash's cards "participate in the filter exactly like any other card"**
-    /// the search predicate narrows this collection exactly as it narrows `LaneView.renderedCards`
+    /// (03-board-ui.md § Trash — "the point of the pivot"), so the search predicate narrows this
-    /// — card rows and lane rows alike, each by its own title and body (`SearchFilter`) — and the
+    /// collection exactly as it narrows `LaneView.renderedCards`, and the count badge follows for
-    /// count badge follows for free, because it reads this same value. Hidden, the column renders
+    /// free because it reads this same value. Hidden, the column renders nothing and registers
-    /// nothing and registers nothing, so "hidden trash is invisible to search" needs no code at all.
+    /// nothing, so "hidden trash is invisible to search" needs no code at all.
-    private var entries: [TrashEntry] {
+    private var cards: [Card] {
         let filter = store.searchFilter
-        return TrashModel.entries(of: store.snapshot).filter { filter.matches($0) }
+        return store.snapshot.trash.filter { filter.matches($0) }
     }
 
     // MARK: - The delete gesture's landing
@@ -140,7 +132,7 @@ struct TrashLaneView: View {
     /// keeps the arrangement the release proposed on screen for that round trip, exactly as every
     /// other container's does (`CommittedHold`).
     private var slots: [TrashSlot] {
-        var result = entries.map(TrashSlot.entry)
+        var result = cards.map(TrashSlot.card)
         guard let proposal else { return result }
         let run = (0..<drops.session.shadowCount).map(TrashSlot.shadow)
         result.insert(contentsOf: run, at: min(max(0, proposal), result.count))
@@ -186,11 +178,10 @@ struct TrashLaneView: View {
         .accessibilityElement(children: .combine)
     }
 
-    /// The entry count — the same collection the body renders, so the badge cannot disagree with
+    /// The card count — the same collection the body renders, so the badge cannot disagree with
-    /// what is on screen (`LaneView.countBadge`'s rule, and it is why m5's filter needs no second
+    /// what is on screen (`LaneView.countBadge`'s rule).
-    /// change here).
     private var countBadge: some View {
-        Text("\(entries.count)")
+        Text("\(cards.count)")
             .font(.caption)
             .monospacedDigit()
             .foregroundStyle(.secondary)
@@ -210,7 +201,7 @@ struct TrashLaneView: View {
         ScrollViewReader { proxy in
             scrollableRows
                 .onChange(of: store.transient.selectionHead) { _, head in
-                    guard let head, entries.contains(where: { $0.id == head }) else { return }
+                    guard let head, cards.contains(where: { $0.id == head }) else { return }
                     proxy.scrollTo(TrashSlot.identity(of: head))
                 }
         }
@@ -227,10 +218,10 @@ struct TrashLaneView: View {
                 ForEach(slots) { slot in
                     Group {
                         switch slot {
-                        case let .entry(entry):
+                        case let .card(card):
-                            TrashEntryRow(
+                            TrashCardRow(
                                 store: store,
-                                entry: entry,
+                                card: card,
                                 confirmations: confirmations,
                                 drops: drops,
                                 registry: marquee.registry
@@ -243,10 +234,10 @@ struct TrashLaneView: View {
                                 .frame(height: nominalRowHeight)
                         }
                     }
-                    // A row is a tombstoned item, so it arrives and leaves in the card's dialect —
+                    // A row is a card, so it arrives and leaves in the card's dialect — a delete
-                    // a delete files one in, a Put Back or a purge takes one out, and both halves of
+                    // files one in, a restore or a purge takes one out, and both halves of that pair
-                    // that pair should read alike from either side of the strip. The transaction is
+                    // should read alike from either side of the strip. The transaction is the
-                    // the reload's, like the lanes' (`Motion.reloadAnimates`).
+                    // reload's, like the lanes' (`Motion.reloadAnimates`).
                     .transition(Motion.cardTransition(reduced: reduceMotion))
                     // The scroll target — `LaneView`'s rule, and outermost for its reason.
                     .id(slot.id)
@@ -271,7 +262,7 @@ struct TrashLaneView: View {
             // as the board background allows on the live side — a drag begun on a row instead is that
             // row's drag-out, and the begin guard makes that geometric rather than a matter of
             // gesture priority (`MarqueeControl`).
-            .simultaneousGesture(marquee.gesture(side: .trashed))
+            .simultaneousGesture(marquee.gesture(in: .trash))
         }
     }
 }
@@ -289,13 +280,10 @@ private struct TrashRowPlate: View {
 
     let symbol: String
 
-    /// The title as written, or `nil` for an untitled item — "Untitled" is a rendering, never a value
+    /// The title as written, or `nil` for an untitled card — "Untitled" is a rendering, never a value
     /// (03-board-ui.md § Card face).
     let title: String?
 
-    /// A lane entry's returning-card count, and nothing else takes a second line.
-    let subtitle: String?
-
     var isSelected: Bool = false
 
     private let cornerRadius: CGFloat = 6
@@ -305,17 +293,10 @@ private struct TrashRowPlate: View {
             Image(systemName: symbol)
                 .foregroundStyle(.secondary)
                 .imageScale(.small)
-            VStack(alignment: .leading, spacing: 2) {
             Text(title ?? "Untitled")
                 .font(.callout)
                 .foregroundStyle(.secondary)
                 .lineLimit(2)
-                if let subtitle {
-                    Text(subtitle)
-                        .font(.caption)
-                        .foregroundStyle(.tertiary)
-                }
-            }
                 .frame(maxWidth: .infinity, alignment: .leading)
         }
         .padding(.horizontal, 8)
@@ -336,22 +317,22 @@ private struct TrashRowPlate: View {
 /// echo reload reads as a *swap* or as a removal and an insertion.
 private enum TrashSlot: Identifiable {
 
-    /// A tombstone the snapshot already holds.
+    /// A card the snapshot's trash already holds.
-    case entry(TrashEntry)
+    case card(Card)
 
     /// One of the drag's N shadows, holding the topmost rows open (04-interactions.md ▸ The trash).
     case shadow(index: Int)
 
     var id: String {
         switch self {
-        case let .entry(entry): Self.identity(of: entry.id)
+        case let .card(card): Self.identity(of: card.id)
         // Constant per position in the run, so a run that grows or shrinks animates as slots rather
         // than blinking (`LaneSlot`'s rule).
         case let .shadow(index): "shadow:\(index)"
         }
     }
 
-    /// An entry slot's id, spelled once so `scrollTo` and the slot cannot disagree about what the
+    /// A card slot's id, spelled once so `scrollTo` and the slot cannot disagree about what the
     /// scroll reader is looking for (`LaneSlot.identity(of:)`).
     static func identity(of item: ItemID) -> String { "entry:\(item.rawValue)" }
 }
@@ -381,145 +362,113 @@ private struct DiagonalHatch: Shape {
 
 // MARK: - Rows
 
-/// One trash row: a compact, dimmed plate carrying the item's symbol and title — and, for a lane
+/// One trash row: a compact, dimmed plate carrying the card's symbol and title.
-/// entry, the count of cards Put Back would return with it.
 ///
 /// **Face-like but not a card face.** It shares the plate, the symbol and the title, and it
 /// deliberately shares none of the face's *editing* affordances: no rename editor, no Open, no
 /// Style…. That is 03-board-ui.md's no-editing-in-the-trash rule expressed as an absence rather
-/// than as a pile of `disabled` modifiers.
+/// than as a pile of `disabled` modifiers. (Making it the ordinary card face is phase 3's — see
-private struct TrashEntryRow: View {
+/// `TrashLaneView`.)
+private struct TrashCardRow: View {
 
     let store: BoardStore
-    let entry: TrashEntry
+    let card: Card
     let confirmations: TrashConfirmations
     let drops: BoardDropContext
 
-    /// Where the rubber band looks up what it is sweeping — the card face's rule, on the trashed
+    /// Where the rubber band looks up what it is sweeping — the card face's rule, in the trash
-    /// side (`View.marqueeTarget`).
+    /// container (`View.marqueeTarget`).
     let registry: MarqueeTargetRegistry
 
-    /// **Lane entries are not draggable** (03-board-ui.md § Trash: "a lane entry is not draggable —
-    /// its entry is a compact row, not the lane; its move-out is Put Back"), so the drag half is
-    /// simply *absent* for them rather than refused — no session, no image, no snap-back. A click
-    /// still selects either way.
-    @ViewBuilder
     var body: some View {
-        if entry.isLaneEntry {
-            plate
-        } else {
         plate.onDrag(startRowDrag, preview: { dragReplica })
     }
-    }
 
     private var plate: some View {
         rowFace
             // The row being dragged out dims in place — the source stays visible in the trash,
             // because a restore is not a removal until the write lands.
-            .opacity(drops.session.isDragging(entry.id) ? ClipboardTreatment.dimmedOpacity : 1)
+            .opacity(drops.session.isDragging(card.id) ? ClipboardTreatment.dimmedOpacity : 1)
-            // The deferred cut wears the same dim wherever it lands, so the treatment is stated for
+            // The deferred cut wears the same dim wherever it lands. It genuinely fires here now:
-            // every surface a `pendingCut` could name rather than for two of the three. In practice
+            // "⌘X works — cut in the trash, paste into a lane is the keyboard-native restore"
-            // it never fires here: ⌘X is disabled on tombstoned selections (04-interactions.md ▸ The
+            // (04-interactions.md ▸ The trash, resettled 2026-07-28).
-            // trash), and a pending cut is homogeneous by liveness — a reload that tombstones a cut
+            .cutTreatment(of: card.id, in: store)
-            // card *ejects* it from the set rather than moving it to the other side.
-            .cutTreatment(of: entry.id, in: store)
             .contentShape(Rectangle())
             .onTapGesture { select() }
-            .marqueeTarget(entry.id, kind: entry.isLaneEntry ? .lane : .card, side: .trashed, in: registry)
+            .marqueeTarget(card.id, kind: .card, container: .trash, in: registry)
             .contextMenu { menu }
     }
 
-    /// This entry as the shared plate draws it — appearance only, no gesture, no context menu and
+    /// This card as the shared plate draws it — appearance only, no gesture, no context menu and
     /// crucially no marquee registration, which is what makes it safe for the drag replica to render
     /// (see `TrashRowPlate`).
     private var rowFace: some View {
         TrashRowPlate(
-            symbol: ItemSymbol.name(entry.icon, fallback: symbolFallback),
+            symbol: ItemSymbol.name(card.icon, fallback: ItemSymbol.card),
-            title: entry.title,
+            title: card.title.value,
-            subtitle: laneSubtitle,
             isSelected: isSelected
         )
     }
 
-    private var symbolFallback: String {
-        entry.isLaneEntry ? ItemSymbol.lane : ItemSymbol.card
-    }
-
-    /// "N cards" — what Put Back brings back with a tombstoned lane, not how many folders sit inside
-    /// it (`TrashModel.entries`' returning-count rule). Card entries have no second line.
-    private var laneSubtitle: String? {
-        guard case let .lane(_, returning) = entry else { return nil }
-        return "\(returning) card\(returning == 1 ? "" : "s")"
-    }
-
     // MARK: - Selection
 
     private var isSelected: Bool {
-        store.selection.liveness == .trashed && store.selection.ids.contains(entry.id)
+        store.selection.container == .trash && store.selection.ids.contains(card.id)
     }
 
-    /// A click selects this row on the **trashed** side, through the same grammar the board's
+    /// A click selects this card in the **trash** container, through the same grammar the board's
     /// surfaces use — plain replaces, ⌘ toggles, ⇧ ranges (`SelectionGrammar`).
     ///
-    /// The row's kind travels with the click, and that is what keeps the trash's second homogeneity
+    /// The container travels with the click, and that is what keeps the one remaining homogeneity
-    /// axis true: a ⌘-click across the card/lane-entry boundary replaces rather than mixing, and a
+    /// boundary true: a ⌘-click across it replaces rather than mixing (04-interactions.md ▸ The
-    /// ⇧-range walks only its own kind's rows (04-interactions.md ▸ The trash). No `togglesOnRepeat`
+    /// trash). There is no kind axis inside the trash any more — lanes are never trashed. No
-    /// — click-again-to-unselect is the lane's behaviour, not a row's.
+    /// `togglesOnRepeat` — click-again-to-unselect is the lane's behaviour, not a card's.
     ///
     /// **A double click is two of these and nothing more**: no editor, no card window, no timer.
     private func select() {
         store.click(
-            SelectionTarget(id: entry.id, kind: entry.isLaneEntry ? .lane : .card, side: .trashed),
+            SelectionTarget(id: card.id, kind: .card, container: .trash),
             modifier: .current
         )
     }
 
     // MARK: - Drag out
 
-    /// Begins the row's drag out of the trash — an ordinary **card session on the trashed side**,
+    /// Begins the card's drag out of the trash — an ordinary **card session in the trash container**,
-    /// which is the whole of what makes it a restore rather than a move (04-interactions.md ▸ The
+    /// which is the whole of what makes it a restore (04-interactions.md ▸ The trash;
-    /// trash; `DragLocality.operation`).
+    /// `DragLocality.operation`).
     ///
     /// Where it lands is the ordinary drop model's answer: `DropSlotMath.cardSlot` over the
-    /// destination lane's masonry, so "restores it at the drop position" is the same arithmetic every
+    /// destination lane's masonry, so "an ordinary move to the drop position" is the same arithmetic
-    /// other card drop uses. What a release *means* differs by locality and modifier, and that lives
+    /// every other card drop uses, committed by the same `moveCards`.
-    /// in one place (`BoardDropContext.commitDrop`): within the board a restore, ⌥ a live copy-out,
-    /// across boards a live copy with ⌘ forcing the true restore-move.
     ///
-    /// **Multi-drag carries the whole trashed selection**, in the trash's own sorted order — the
+    /// **Multi-drag carries the whole trash selection**, in the column's own order — the order the
-    /// order the rows are drawn in, which is the only relative order a set of tombstones has.
+    /// rows are drawn in, which is `order` ascending like any lane's.
     ///
     /// Refused under the read-only lock and while an inline editor is focused, like every other
     /// mutating gesture.
     private func startRowDrag() -> NSItemProvider {
         guard !store.isReadOnly, !store.isEditingInline else { return NSItemProvider() }
         let selection = store.selection
-        let ids: Set<ItemID> = selection.liveness == .trashed
+        let ids: Set<ItemID> = selection.container == .trash
-            && selection.ids.contains(entry.id)
+            && selection.ids.contains(card.id)
             && selection.ids.count > 1
             ? selection.ids
-            : [entry.id]
+            : [card.id]
 
-        // Card entries only: a lane entry cannot be dragged at all, so one caught up in a mixed
+        let rows = store.snapshot.trash.filter { ids.contains($0.id) }
-        // selection is simply not carried. (The selection is homogeneous by kind anyway — this is
-        // belt over braces.)
-        let rows: [(id: ItemID, laneID: ItemID, title: String?)] = TrashModel.entries(of: store.snapshot)
-            .compactMap { candidate in
-                guard ids.contains(candidate.id), case let .card(card, laneID) = candidate else { return nil }
-                return (card.id, laneID, card.title.value)
-            }
         guard !rows.isEmpty else { return NSItemProvider() }
 
         let root = store.rootURL
         let payload = DragPayload(
             boardRoot: root,
             kind: .cards,
-            side: .trashed,
+            container: .trash,
             items: rows.map {
                 DragPayload.Item(
                     id: $0.id.rawValue,
-                    folder: TrashModel.ItemPath(laneID: $0.laneID, cardID: $0.id).folder(under: root).path,
+                    folder: ItemPath.trashCard($0.id).folder(under: root).path,
-                    title: $0.title
+                    title: $0.title.value
                 )
             }
         )
@@ -527,7 +476,7 @@ private struct TrashEntryRow: View {
             rows.map(\.id),
             folders: payload.folders,
             heights: rows.map { _ in LaneDropRegistry.nominalCardHeight },
-            side: .trashed,
+            container: .trash,
             source: store
         )
         return payload.itemProvider()
@@ -536,7 +485,7 @@ private struct TrashEntryRow: View {
     /// The image under the cursor: the row as it is drawn, fanned with a count badge for a
     /// multi-drag — the card replica's treatment, at a trash row's size.
     private var dragReplica: some View {
-        let count = store.selection.liveness == .trashed && store.selection.ids.contains(entry.id)
+        let count = store.selection.container == .trash && store.selection.ids.contains(card.id)
             ? max(1, store.selection.ids.count)
             : 1
         return ZStack {
@@ -549,22 +498,18 @@ private struct TrashEntryRow: View {
         .padding(12)
     }
 
-    // MARK: - The trash entry's context menu
+    // MARK: - The trash card's context menu
 
-    /// Put Back, Delete Immediately, Reveal in Finder — the three rows 11-command-nexus.md gives a
+    /// Delete and Reveal in Finder — the two rows 11-command-nexus.md gives a trash card, and no
-    /// trash entry, and no others.
+    /// others ("Trash cards | Delete (permanent — 03's recoverability confirm), Reveal in Finder").
     ///
+    /// **Put Back is gone** with the tombstone model: restoring is drag-out or ⌘X/⌘V (03 § Trash).
     /// Reveal in Finder is the odd one out and deliberately so: it is "not edit-shaped and stays
-    /// enabled on tombstoned selections", read-only lock included — inspecting a folder before a
+    /// enabled on trash selections", read-only lock included — inspecting a folder before a purge is
-    /// purge is exactly the errand it exists for.
+    /// exactly the errand it exists for.
     @ViewBuilder
     private var menu: some View {
-        Button("Put Back") {
+        Button("Delete") {
-            store.putBack(targetIDs)
-        }
-        .disabled(!store.acceptsBoardMutations)
-
-        Button("Delete Immediately") {
             confirmations.requestPurge(of: targetIDs, in: store)
         }
         .disabled(!store.acceptsBoardMutations)
@@ -578,17 +523,16 @@ private struct TrashEntryRow: View {
 
     /// What this row's menu acts on: the whole selection when this row is part of it, else this row
     /// alone — standard macOS context-menu targeting, and the same rule the card face and the lane
-    /// header apply to Style…. Right-clicking something outside the selection acts on what was
+    /// header apply to Style….
-    /// clicked, which is also what keeps a cross-kind menu from ever acting on a mixed set.
     private var targetIDs: Set<ItemID> {
-        guard store.selection.liveness == .trashed, store.selection.ids.contains(entry.id) else {
+        guard store.selection.container == .trash, store.selection.ids.contains(card.id) else {
-            return [entry.id]
+            return [card.id]
         }
         return store.selection.ids
     }
 
     private var targetFolders: [URL] {
-        TrashModel.paths(of: targetIDs, on: .trashed, in: store.snapshot)
+        ItemPath.resolve(targetIDs, in: .trash, snapshot: store.snapshot)
             .map { $0.folder(under: store.rootURL) }
     }
 }

KanbanTests/AppModelTests.swift

@@ -24,22 +24,12 @@ private func makeMixedBoard() throws -> WriterFixture {
     try fixture.item(Ident.lane1, Item.rich(order: "1024", title: "Todo"))
     try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "First"))
     try fixture.item("\(Ident.lane1)/\(Ident.card2)", Item.rich(order: "2048", title: "Second"))
-    try fixture.item(
-        "\(Ident.lane1)/\(Ident.card3)",
-        "---\nschema: 1\norder: 3072\ntitle: Gone\ndeleted: 2026-01-01T00:00:00Z\n---\nbody\n"
-    )
 
-    try fixture.item(
+    try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Archive"))
-        Ident.lane2,
-        "---\nschema: 1\norder: 2048\ntitle: Archive\ndeleted: 2026-01-01T00:00:00Z\n---\nbody\n"
-    )
-    try fixture.item("\(Ident.lane2)/\(Ident.card4)", Item.rich(order: "1024", title: "Buried"))
-    try fixture.item(
-        "\(Ident.lane2)/\(Ident.indexless)",
-        "---\nschema: 1\norder: 2048\ntitle: Also buried\n---\nbody\n"
-    )
 
-    try fixture.item(Ident.lane3, Item.rich(order: "3072", title: "Doing"))
+    // The trash: cards in a sibling container, never lanes (03-board-ui.md § Trash).
+    try fixture.item(".trash/\(Ident.card3)", Item.rich(order: "1024", title: "Gone"))
+    try fixture.item(".trash/\(Ident.card4)", Item.rich(order: "2048", title: "Also gone"))
     return fixture
 }
 
@@ -76,54 +66,35 @@ struct AppModelTests {
 
     // MARK: Live-only counts
 
-    @Test("The recents counts are live items only, at both levels")
+    @Test("The recents counts are working items only — the trash is an errand, not inventory")
-    func liveCountsIgnoreTombstonesAndWhatHidesBeneathThem() throws {
+    func liveCountsExcludeTheTrash() throws {
         let fixture = try makeMixedBoard()
         defer { fixture.tearDown() }
         let snapshot = try BoardLoader.load(boardRoot: fixture.root).model
 
-        // The snapshot itself keeps everything — tombstones are what the trash renders — so this is a
+        // The snapshot itself keeps everything — the trash is a sibling container — so this is a
-        // genuine filter, not a property of the load.
+        // genuine exclusion, not a property of the load.
-        #expect(snapshot.lanes.count == 3)
+        #expect(snapshot.lanes.count == 2)
-        #expect(snapshot.lanes.flatMap(\.cards).count == 5)
+        #expect(snapshot.trash.count == 2)
 
         let counts = AppModel.liveCounts(of: snapshot)
-        #expect(counts.lanes == 2, "the tombstoned lane is not part of the board's working size")
+        #expect(counts.lanes == 2)
-        #expect(counts.cards == 2, "one tombstoned card, and two more hidden beneath a tombstoned lane")
+        // 02 § Per-board app state, re-grounded 2026-07-28: "cards in `.trash/` don't count; the row
+        // advertises the board's working size". The walk reads `snapshot.lanes` and the trash is
+        // `snapshot.trash`, so the exclusion is by construction and none could be forgotten.
+        #expect(counts.cards == 2)
     }
 
-    @Test("A board with nothing live counts zero rather than declining to answer")
+    @Test("A board with nothing on it counts zero rather than declining to answer")
     func liveCountsOfAnEmptyBoard() throws {
         let fixture = try WriterFixture()
         defer { fixture.tearDown() }
         try fixture.item("", Item.board)
-        try fixture.item(
+        try fixture.item(".trash/\(Ident.card1)", Item.rich(order: "1024", title: "Gone"))
-            Ident.lane1,
-            "---\nschema: 1\norder: 1024\ntitle: Gone\ndeleted: 2026-01-01T00:00:00Z\n---\nbody\n"
-        )
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "Buried"))
 
         let counts = AppModel.liveCounts(of: try BoardLoader.load(boardRoot: fixture.root).model)
         #expect(counts.lanes == 0)
-        #expect(counts.cards == 0)
+        #expect(counts.cards == 0, "a board whose only content is trash advertises no working size")
-    }
-
-    @Test("A malformed deleted: still counts as deleted")
-    func liveCountsFollowPresenceNotValidity() throws {
-        let fixture = try WriterFixture()
-        defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, Item.rich(order: "1024", title: "Todo"))
-        try fixture.item(
-            "\(Ident.lane1)/\(Ident.card1)",
-            "---\nschema: 1\norder: 1024\ntitle: Gone\ndeleted: yesterday\n---\nbody\n"
-        )
-
-        // The presence of the key is what encodes deletion intent (`Card.isDeleted`), so an
-        // unparseable timestamp hides the card here exactly as it hides it on the board.
-        let counts = AppModel.liveCounts(of: try BoardLoader.load(boardRoot: fixture.root).model)
-        #expect(counts.lanes == 1)
-        #expect(counts.cards == 0)
     }
 
     // MARK: Display name
@@ -241,7 +212,7 @@ struct AppModelTests {
         #expect(model.storeRegistry.liveStore(for: fixture.root) == nil, "the last reference went with the session")
 
         let record = try #require(model.boardRegistry.record(id: recordID))
-        #expect(record.laneCount == 2, "the counts the welcome row will show are the live ones")
+        #expect(record.laneCount == 2, "the counts the welcome row will show are the working ones")
         #expect(record.cardCount == 2)
         #expect(record.isOpenNow == false)
         #expect(model.boardRegistry.restorables().isEmpty)

KanbanTests/BoardStoreTests.swift

@@ -364,7 +364,7 @@ struct BoardStoreTests {
         #expect(!ran)
 
         // Reading stays live throughout — keeping the last-good snapshot is the point of the lock.
-        store.select([ItemID(rawValue: Ident.card2)], liveness: .live)
+        store.select([ItemID(rawValue: Ident.card2)], in: .board)
         #expect(store.selection.ids.count == 1)
 
         try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "Repaired"))
@@ -421,50 +421,48 @@ struct BoardStoreTests {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
-        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], liveness: .live)
+        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], in: .board)
 
         try FileManager.default.removeItem(at: fixture.url("\(Ident.lane1)/\(Ident.card1)"))
         store.handleWatcherEvent(.treeChanged(.foreign))
         await store.awaitQuiescence()
 
         #expect(store.selection.ids == [ItemID(rawValue: Ident.card2)])
-        #expect(store.selection.liveness == .live)
+        #expect(store.selection.container == .board)
     }
 
-    @Test("A liveness flip is a vanish: a selected card tombstoned externally leaves the selection")
+    @Test("A container crossing is a vanish: a selected card trashed externally leaves the selection")
-    func selectionEjectsALivenessFlip() async throws {
+    func selectionEjectsAContainerCrossing() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
-        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], liveness: .live)
+        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], in: .board)
 
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", tombstoned(order: "1024", title: "First"))
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
         store.handleWatcherEvent(.treeChanged(.foreign))
         await store.awaitQuiescence()
 
-        // Still in the snapshot — the trash renders it — but no longer on the selection's side of
+        // Still in the snapshot — the trash renders it — but no longer in the selection's container,
-        // the boundary, so the homogeneous-by-liveness invariant survives a foreign edit.
+        // so 04's one-container invariant survives a foreign edit (02-architecture.md's reload rule,
-        let flipped = lane(Ident.lane1, in: store.snapshot)?.cards.first { $0.id.rawValue == Ident.card1 }
+        // resettled 2026-07-28: "re-resolution matches UUID *and* container side").
-        #expect(flipped?.isDeleted == true)
+        #expect(store.snapshot.trash.map(\.id.rawValue) == [Ident.card1])
         #expect(store.selection.ids == [ItemID(rawValue: Ident.card2)])
     }
 
-    @Test("Tombstoning a lane ejects its cards from a live selection — liveness is effective")
+    @Test("Deleting a lane externally takes its cards out of the selection with it")
-    func selectionEjectsCardsUnderATombstonedLane() async throws {
+    func selectionEjectsCardsUnderARemovedLane() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
-        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], liveness: .live)
+        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], in: .board)
 
-        try fixture.item(Ident.lane1, tombstoned(order: "1024", title: "Lane one"))
+        // A lane delete is physical now (03-board-ui.md § Trash), so the cards genuinely go with it
+        // — no ancestor walk needed, and none left to do: presence is the whole test.
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane1))
         store.handleWatcherEvent(.treeChanged(.foreign))
         await store.awaitQuiescence()
 
-        // The cards' own flags never changed, but their lane's did — and liveness is
+        #expect(store.snapshot.lanes.first { $0.id.rawValue == Ident.lane1 } == nil)
-        // ancestor-walked (02, settled): the cards render nowhere once 03 collapses the lane to
-        // a single trash entry, and nothing invisible may stay selected.
-        let survivor = lane(Ident.lane1, in: store.snapshot)?.cards.first { $0.id.rawValue == Ident.card1 }
-        #expect(survivor?.isDeleted == false, "the card's own flag is untouched")
         #expect(store.selection.ids.isEmpty)
     }
 
@@ -473,7 +471,7 @@ struct BoardStoreTests {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
-        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], liveness: .live)
+        store.select([ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)], in: .board)
 
         try FileManager.default.removeItem(at: fixture.url("\(Ident.lane1)/\(Ident.card1)"))
         try FileManager.default.removeItem(at: fixture.url("\(Ident.lane1)/\(Ident.card2)"))
@@ -481,9 +479,9 @@ struct BoardStoreTests {
         await store.awaitQuiescence()
 
         #expect(store.selection.ids.isEmpty)
-        #expect(store.selection.liveness == .live, "the side survives even when the membership does not")
+        #expect(store.selection.container == .board, "the container survives even when the membership does not")
 
-        store.select([ItemID(rawValue: Ident.lane1)], liveness: .live)
+        store.select([ItemID(rawValue: Ident.lane1)], in: .board)
         store.clearSelection()
         #expect(store.selection == .empty)
     }

KanbanTests/CardAttachmentsTests.swift

@@ -191,13 +191,12 @@ struct RemoveAttachmentStoreTests {
         try fixture.file("\(Ident.lane1)/\(Ident.card1)/attachments/shot.png", Data([0x02]))
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.removeAttachment(named: "shot.png", fromCard: card2)                             // tombstoned
+        store.removeAttachment(named: "shot.png", fromCard: ItemID(rawValue: Ident.lane2))      // a lane
         store.removeAttachment(named: "shot.png", fromCard: ItemID(rawValue: Ident.indexless))  // no such card
         store.removeAttachment(named: "shot.png", fromCard: lane1)                              // a lane
         store.removeAttachment(named: "", fromCard: card1)                                      // no name
 
         #expect(try fixture.entryNames("\(Ident.lane1)/\(Ident.card1)/attachments") == ["shot.png"])
-        #expect(try fixture.entryNames("\(Ident.lane1)/\(Ident.card2)/attachments") == ["shot.png"])
         #expect(store.banners.oneShots.isEmpty, "a vanished target is a silent no-op, not a failure")
     }
 

KanbanTests/CardWindowFateTests.swift

@@ -3,14 +3,18 @@ import Testing
 @testable import Kanban
 
 /// A card window's whole lifecycle is one decision re-taken on every snapshot: does this key still
-/// name a card? Four answers, three of which are "no" for different reasons, and the one that is
+/// name a card **on the board**? The decision is a pure function and this is its suite; nothing here
-/// easiest to get wrong — a live card under a tombstoned lane — is invisible in the card's own data.
+/// needs a window.
-/// So the decision is a pure function and this is its suite; nothing here needs a window.
+///
+/// **The walk got simpler with the materialized trash** (05-card-window.md ▸ Deletion & lifecycle,
+/// resettled 2026-07-28): "entering the trash counts as deleted", and a trashed card's folder has
+/// physically left its lane — so "is it under one of this board's lanes" is the whole question, and
+/// the tombstone era's ancestor walk is gone.
 
 // MARK: - Fixtures
 
-/// - lane 1 (live): one live card, one tombstoned card
+/// - lane 1: one card
-/// - lane 2 (**tombstoned**): one live card, whose own flag is clear
+/// - the trash: one card, moved there by a delete
 @MainActor
 private func makeBoard() throws -> WriterFixture {
     let fixture = try WriterFixture()
@@ -18,16 +22,7 @@ private func makeBoard() throws -> WriterFixture {
 
     try fixture.item(Ident.lane1, Item.rich(order: "1024", title: "Todo"))
     try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "Fix login"))
-    try fixture.item(
+    try fixture.item(".trash/\(Ident.card2)", Item.rich(order: "1024", title: "Gone"))
-        "\(Ident.lane1)/\(Ident.card2)",
-        "---\nschema: 1\norder: 2048\ntitle: Gone\ndeleted: 2026-01-01T00:00:00Z\n---\nbody\n"
-    )
-
-    try fixture.item(
-        Ident.lane2,
-        "---\nschema: 1\norder: 2048\ntitle: Archive\ndeleted: 2026-01-01T00:00:00Z\n---\nbody\n"
-    )
-    try fixture.item("\(Ident.lane2)/\(Ident.card3)", Item.rich(order: "1024", title: "Buried alive"))
     return fixture
 }
 
@@ -62,30 +57,29 @@ struct CardWindowFateTests {
         #expect(laneTitle(fate) == "Todo")
     }
 
-    @Test("A tombstoned card dismisses its window")
+    @Test("A card in the trash dismisses its window")
-    func aTombstonedCardDismisses() throws {
+    func aTrashedCardDismisses() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let snapshot = try BoardLoader.load(boardRoot: fixture.root).model
 
-        // ⌫ on the board closes the card's open window — "a tombstone counts as deleted"
+        // ⌫ on the board closes the card's open window — "entering the trash counts as deleted"
-        // (05-card-window.md). The card is still in the snapshot; the trash renders it.
+        // (05-card-window.md). The card is still in the snapshot; the trash column renders it.
-        #expect(snapshot.lanes[0].cards.contains { $0.id.rawValue == Ident.card2 })
+        #expect(snapshot.trash.contains { $0.id.rawValue == Ident.card2 })
         #expect(CardWindowHost.cardWindowFate(cardID: Ident.card2, in: snapshot) == .dismisses)
     }
 
-    @Test("A live card under a tombstoned lane dismisses too — liveness is ancestor-walked")
+    @Test("Deleting a card's lane dismisses its window, because the card is gone with it")
-    func aLaneTombstoneDismissesItsCards() throws {
+    func aLaneDeleteDismissesItsCards() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane1))
         let snapshot = try BoardLoader.load(boardRoot: fixture.root).model
 
-        // The card's own flag says nothing is wrong. Its lane's does, and 03-board-ui.md collapses a
+        // "Deleting the card's *lane* deletes the card with it — the window dismisses because the
-        // tombstoned lane to one restorable trash entry — so the card renders nowhere, and a window
+        // card is gone" (05). A lane delete is physical, so this needs no ancestor walk: the card
-        // onto something that renders nowhere is the case this walk exists for.
+        // is simply not in the snapshot.
-        let buried = try #require(snapshot.lanes.first { $0.id.rawValue == Ident.lane2 }?.cards.first)
+        #expect(CardWindowHost.cardWindowFate(cardID: Ident.card1, in: snapshot) == .dismisses)
-        #expect(!buried.isDeleted)
-        #expect(CardWindowHost.cardWindowFate(cardID: Ident.card3, in: snapshot) == .dismisses)
     }
 
     @Test("A card that is not in this board's snapshot dismisses — the cross-board move")

KanbanTests/ClipboardTests.swift

@@ -52,21 +52,21 @@ let clipboardCard2 = ItemID(rawValue: Ident.card2)
 let clipboardCard3 = ItemID(rawValue: Ident.card3)
 let clipboardCard4 = ItemID(rawValue: Ident.card4)
 
-func tombstonedItem(order: String, title: String) -> String {
+/// An ordinary card body, for the trash's resident.
+func trashResidentItem(order: String, title: String) -> String {
     """
     ---
     schema: 1
     title: \(title)
     order: \(order)
     created: 2026-01-01T09:00:00Z
-    deleted: 2026-03-03T09:00:00Z
     ---
     \(title) body.
 
     """
 }
 
-/// Two lanes: `lane1` holds three live cards and one tombstoned one, `lane2` holds a single card.
+/// Two lanes: `lane1` holds two cards, `lane2` holds a single card, and one card sits in the trash.
 /// `card1` carries two attachments, which is what makes "the snapshot travels whole" and "the
 /// fallback lost exactly two files" both assertable.
 @MainActor
@@ -78,9 +78,9 @@ func makeClipboardBoard() throws -> WriterFixture {
     try fixture.file("\(Ident.lane1)/\(Ident.card1)/attachments/photo.png", Data("png bytes".utf8))
     try fixture.file("\(Ident.lane1)/\(Ident.card1)/attachments/notes.txt", Data("notes".utf8))
     try fixture.item("\(Ident.lane1)/\(Ident.card2)", Item.rich(order: "2048", title: "Second"))
-    try fixture.item("\(Ident.lane1)/\(Ident.card3)", tombstonedItem(order: "3072", title: "Trashed"))
     try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Doing"))
     try fixture.item("\(Ident.lane2)/\(Ident.card4)", Item.rich(order: "1024", title: "Fourth"))
+    try fixture.item(".trash/\(Ident.card3)", trashResidentItem(order: "1024", title: "Trashed"))
     return fixture
 }
 
@@ -140,7 +140,7 @@ struct ClipboardManifestTests {
             copyID: "abc",
             boardRoot: URL(fileURLWithPath: "/tmp/Board.kanban", isDirectory: true),
             kind: .card,
-            side: .live,
+            container: .board,
             entries: [entry(Ident.card1)]
         )
         let data = try #require(manifest.encoded())
@@ -153,7 +153,7 @@ struct ClipboardManifestTests {
             copyID: "abc",
             boardRoot: URL(fileURLWithPath: "/tmp/B", isDirectory: true),
             kind: .card,
-            side: .live,
+            container: .board,
             entries: [entry(Ident.card1)]
         )
         manifest.version = ClipboardManifest.currentVersion + 1
@@ -167,7 +167,7 @@ struct ClipboardManifestTests {
             copyID: "abc",
             boardRoot: URL(fileURLWithPath: "/tmp/B", isDirectory: true),
             kind: .card,
-            side: .live,
+            container: .board,
             entries: []
         )
         let data = try #require(manifest.encoded())
@@ -200,7 +200,7 @@ struct ClipboardManifestTests {
             copyID: "abc",
             boardRoot: URL(fileURLWithPath: "/tmp/B", isDirectory: true),
             kind: .card,
-            side: .live,
+            container: .board,
             entries: [titled, untitled]
         )
         #expect(manifest.plainText == "First\nUntitled")
@@ -218,7 +218,7 @@ struct ClipboardCopyTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
 
@@ -238,12 +238,12 @@ struct ClipboardCopyTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1, clipboardCard2], liveness: .live)
+        harness.store.select([clipboardCard1, clipboardCard2], in: .board)
         harness.clipboard.copy(from: harness.store)
 
         let manifest = try #require(harness.clipboard.payload)
         #expect(manifest.kind == .card)
-        #expect(manifest.side == .live)
+        #expect(manifest.container == .board)
         #expect(manifest.rootURL.path == harness.fixture.root.path)
         // Flatten order — lane `order`, then card `order`.
         #expect(manifest.entries.map(\.id) == [Ident.card1, Ident.card2])
@@ -258,7 +258,7 @@ struct ClipboardCopyTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
 
         let manifest = try #require(harness.clipboard.payload)
@@ -266,12 +266,12 @@ struct ClipboardCopyTests {
         #expect(manifest.entries[0].index == onDisk)
     }
 
-    @Test("A lane copy embeds its live cards and leaves the tombstoned one out")
+    @Test("A lane copy embeds exactly its cards — the trash is board-level, so none is nested")
-    func laneEntryEmbedsLiveCards() async throws {
+    func laneEntryEmbedsItsCards() async throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardLane1], liveness: .live)
+        harness.store.select([clipboardLane1], in: .board)
         harness.clipboard.copy(from: harness.store)
 
         let manifest = try #require(harness.clipboard.payload)
@@ -281,17 +281,17 @@ struct ClipboardCopyTests {
         #expect(manifest.entries[0].lostAttachmentCount == 2)
     }
 
-    @Test("A trashed selection copies out, side recorded")
+    @Test("A trash selection copies out, container recorded")
-    func trashedSide() async throws {
+    func trashContainerRecorded() async throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
         harness.store.transient.isTrashVisible = true
-        harness.store.select([clipboardCard3], liveness: .trashed)
+        harness.store.select([clipboardCard3], in: .trash)
         harness.clipboard.copy(from: harness.store)
 
         let manifest = try #require(harness.clipboard.payload)
-        #expect(manifest.side == .trashed)
+        #expect(manifest.container == .trash)
         #expect(manifest.entries.map(\.id) == [Ident.card3])
     }
 
@@ -310,12 +310,12 @@ struct ClipboardCopyTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         let first = try #require(harness.clipboard.payload?.copyID)
 
-        harness.store.select([clipboardCard2], liveness: .live)
+        harness.store.select([clipboardCard2], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         let second = try #require(harness.clipboard.payload?.copyID)
@@ -365,7 +365,7 @@ struct ClipboardSweepTests {
             withIntermediateDirectories: true
         )
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
 
@@ -378,7 +378,7 @@ struct ClipboardSweepTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         #expect(try harness.stagedCopyIDs().count == 1)
@@ -402,7 +402,7 @@ struct ClipboardTakeoverTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         #expect(harness.clipboard.payload != nil)
 
@@ -417,7 +417,7 @@ struct ClipboardTakeoverTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         let before = harness.pasteboard.changeCount
         harness.clipboard.refresh()
@@ -432,7 +432,7 @@ struct ClipboardTakeoverTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.cut(from: harness.store)
         #expect(harness.store.transient.pendingCut.ids == [clipboardCard1])
 
@@ -453,11 +453,11 @@ struct ClipboardCutTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1, clipboardCard4], liveness: .live)
+        harness.store.select([clipboardCard1, clipboardCard4], in: .board)
         harness.clipboard.cut(from: harness.store)
 
         #expect(harness.store.transient.pendingCut.ids == [clipboardCard1, clipboardCard4])
-        #expect(harness.store.transient.pendingCut.liveness == .live)
+        #expect(harness.store.transient.pendingCut.container == .board)
     }
 
     @Test("A second copy voids the pending cut — its pasteboard entry has been overwritten")
@@ -465,21 +465,21 @@ struct ClipboardCutTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.cut(from: harness.store)
         #expect(!harness.store.transient.pendingCut.isEmpty)
 
-        harness.store.select([clipboardCard2], liveness: .live)
+        harness.store.select([clipboardCard2], in: .board)
         harness.clipboard.copy(from: harness.store)
         #expect(harness.store.transient.pendingCut.isEmpty)
     }
 
-    @Test("Deletion voids per item: a tombstoned cut member leaves the pending set on reload")
+    @Test("Deletion voids per item: a deleted cut member leaves the pending set on reload")
     func deletionVoidsPerItem() async throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1, clipboardCard2], liveness: .live)
+        harness.store.select([clipboardCard1, clipboardCard2], in: .board)
         harness.clipboard.cut(from: harness.store)
 
         harness.store.delete([clipboardCard1])
@@ -502,19 +502,22 @@ struct ClipboardAvailabilityTests {
         defer { harness.tearDown() }
 
         #expect(harness.clipboard.canCopy(from: harness.store) == false)
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         #expect(harness.clipboard.canCopy(from: harness.store))
     }
 
-    @Test("Copy works on a trashed selection; cut does not")
+    /// 04-interactions.md ▸ The trash, resettled 2026-07-28: "⌘X **works** (it was disabled under
-    func trashIsCopyOutOnly() throws {
+    /// the tombstone model): cut in the trash, paste into a lane is the keyboard-native restore, an
+    /// ordinary folder move."
+    @Test("Both copy and cut work on a trash selection — cut is the keyboard restore")
+    func trashTakesCopyAndCut() throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
         harness.store.transient.isTrashVisible = true
-        harness.store.select([clipboardCard3], liveness: .trashed)
+        harness.store.select([clipboardCard3], in: .trash)
         #expect(harness.clipboard.canCopy(from: harness.store))
-        #expect(harness.clipboard.canCut(from: harness.store) == false)
+        #expect(harness.clipboard.canCut(from: harness.store))
     }
 
     @Test("The read-only lock blocks cut but never copy")
@@ -522,7 +525,7 @@ struct ClipboardAvailabilityTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.store.enterVanishedRootLock()
         #expect(harness.clipboard.canCopy(from: harness.store))
         #expect(harness.clipboard.canCut(from: harness.store) == false)
@@ -534,7 +537,7 @@ struct ClipboardAvailabilityTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         harness.store.transient.beginRename(of: clipboardCard1, currentTitle: "First")
 
@@ -549,7 +552,7 @@ struct ClipboardAvailabilityTests {
         defer { harness.tearDown() }
 
         #expect(harness.clipboard.canPaste(into: harness.store) == false)
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         #expect(harness.clipboard.canPaste(into: harness.store))
     }
@@ -573,11 +576,11 @@ struct ClipboardAvailabilityTests {
         let sourceStore = try BoardStore(rootURL: source.root)
         let emptyStore = try BoardStore(rootURL: empty.root)
 
-        sourceStore.select([clipboardCard1], liveness: .live)
+        sourceStore.select([clipboardCard1], in: .board)
         clipboard.copy(from: sourceStore)
         #expect(clipboard.canPaste(into: emptyStore) == false)
 
-        sourceStore.select([clipboardLane1], liveness: .live)
+        sourceStore.select([clipboardLane1], in: .board)
         clipboard.copy(from: sourceStore)
         #expect(clipboard.canPaste(into: emptyStore))
     }
@@ -600,7 +603,7 @@ struct PasteTargetTests {
         let model = try snapshot(fixture)
 
         let target = PasteTarget.cards(
-            selection: ItemReferenceSet(ids: [clipboardCard1], liveness: .live),
+            selection: ItemReferenceSet(ids: [clipboardCard1], container: .board),
             lastActiveLaneID: nil,
             snapshot: model
         )
@@ -614,11 +617,11 @@ struct PasteTargetTests {
         let model = try snapshot(fixture)
 
         let target = PasteTarget.cards(
-            selection: ItemReferenceSet(ids: [clipboardLane1], liveness: .live),
+            selection: ItemReferenceSet(ids: [clipboardLane1], container: .board),
             lastActiveLaneID: nil,
             snapshot: model
         )
-        // Two rendered cards — the tombstoned third is not in the layout.
+        // Two rendered cards.
         #expect(target == PasteTarget.Cards(laneID: clipboardLane1, index: 2))
     }
 
@@ -629,7 +632,7 @@ struct PasteTargetTests {
         let model = try snapshot(fixture)
 
         let target = PasteTarget.cards(
-            selection: ItemReferenceSet(ids: [clipboardCard4, clipboardCard1], liveness: .live),
+            selection: ItemReferenceSet(ids: [clipboardCard4, clipboardCard1], container: .board),
             lastActiveLaneID: nil,
             snapshot: model
         )
@@ -637,18 +640,18 @@ struct PasteTargetTests {
         #expect(target == PasteTarget.Cards(laneID: clipboardLane2, index: 1))
     }
 
-    @Test("A tombstoned selection never anchors: it behaves as nothing selected")
+    @Test("A trash selection never anchors: it behaves as nothing selected")
-    func tombstonedSelectionNeverAnchors() throws {
+    func trashSelectionNeverAnchors() throws {
         let fixture = try makeClipboardBoard()
         defer { fixture.tearDown() }
         let model = try snapshot(fixture)
 
         let target = PasteTarget.cards(
-            selection: ItemReferenceSet(ids: [clipboardCard3], liveness: .trashed),
+            selection: ItemReferenceSet(ids: [clipboardCard3], container: .trash),
             lastActiveLaneID: clipboardLane2,
             snapshot: model
         )
-        // The last-active lane, appended — never `card3`'s live disk-lane.
+        // The last-active lane, appended — the trash is never the destination.
         #expect(target == PasteTarget.Cards(laneID: clipboardLane2, index: 1))
     }
 
@@ -679,7 +682,7 @@ struct PasteTargetTests {
         let model = try snapshot(fixture)
 
         #expect(PasteTarget.lanes(
-            selection: ItemReferenceSet(ids: [clipboardLane1], liveness: .live),
+            selection: ItemReferenceSet(ids: [clipboardLane1], container: .board),
             snapshot: model
         ) == 1)
     }
@@ -691,12 +694,12 @@ struct PasteTargetTests {
         let model = try snapshot(fixture)
 
         #expect(PasteTarget.lanes(
-            selection: ItemReferenceSet(ids: [clipboardCard1], liveness: .live),
+            selection: ItemReferenceSet(ids: [clipboardCard1], container: .board),
             snapshot: model
         ) == 1)
     }
 
-    @Test("Nothing (or something tombstoned) selected lands a lane at the board's right end")
+    @Test("Nothing (or a trash selection) lands a lane at the board's right end")
     func rightEnd() throws {
         let fixture = try makeClipboardBoard()
         defer { fixture.tearDown() }
@@ -704,7 +707,7 @@ struct PasteTargetTests {
 
         #expect(PasteTarget.lanes(selection: .empty, snapshot: model) == 2)
         #expect(PasteTarget.lanes(
-            selection: ItemReferenceSet(ids: [clipboardCard3], liveness: .trashed),
+            selection: ItemReferenceSet(ids: [clipboardCard3], container: .trash),
             snapshot: model
         ) == 2)
     }

KanbanTests/DragSessionTests.swift

@@ -15,11 +15,11 @@ import Testing
 @Suite("DragPayload")
 struct DragPayloadTests {
 
-    private static func payload(kind: DragKind = .cards, side: Liveness = .live) -> DragPayload {
+    private static func payload(kind: DragKind = .cards, container: ItemContainer = .board) -> DragPayload {
         DragPayload(
             boardRoot: URL(fileURLWithPath: "/Boards/Work.kanban", isDirectory: true),
             kind: kind,
-            side: side,
+            container: container,
             items: [
                 DragPayload.Item(id: "aaa", folder: "/Boards/Work.kanban/lane/aaa", title: "First"),
                 DragPayload.Item(id: "bbb", folder: "/Boards/Work.kanban/lane/bbb", title: nil)
@@ -30,8 +30,8 @@ struct DragPayloadTests {
     @Test("A payload round-trips through its JSON representation unchanged")
     func roundTrip() throws {
         for kind in [DragKind.cards, .lanes] {
-            for side in [Liveness.live, .trashed] {
+            for container in [ItemContainer.board, .trash] {
-                let original = Self.payload(kind: kind, side: side)
+                let original = Self.payload(kind: kind, container: container)
                 let data = try #require(original.encoded())
                 #expect(DragPayload(data: data) == original)
             }
@@ -62,10 +62,10 @@ struct DragPayloadTests {
         #expect(Self.payload().plainText == "First\nUntitled")
     }
 
-    @Test("The side survives the round trip, because it is what makes a trash drag a trash drag")
+    @Test("The container survives the round trip, because it is what makes a trash drag a trash drag")
-    func sideSurvives() throws {
+    func containerSurvives() throws {
-        let data = try #require(Self.payload(side: .trashed).encoded())
+        let data = try #require(Self.payload(container: .trash).encoded())
-        #expect(DragPayload(data: data)?.side.liveness == .trashed)
+        #expect(DragPayload(data: data)?.container == .trash)
     }
 }
 
@@ -95,25 +95,25 @@ struct DragLocalityTests {
     /// The Finder volume model: within a board a drag rearranges, between boards it transfers.
     @Test("Locality picks the default — within is a move, across is a copy")
     func theDefault() {
-        #expect(DragLocality.operation(kind: .cards, side: .live, isWithinBoard: true, modifiers: none) == .move)
+        #expect(DragLocality.operation(kind: .cards, container: .board, isWithinBoard: true, modifiers: none) == .move)
-        #expect(DragLocality.operation(kind: .cards, side: .live, isWithinBoard: false, modifiers: none) == .copy)
+        #expect(DragLocality.operation(kind: .cards, container: .board, isWithinBoard: false, modifiers: none) == .copy)
-        #expect(DragLocality.operation(kind: .lanes, side: .live, isWithinBoard: false, modifiers: none) == .copy)
+        #expect(DragLocality.operation(kind: .lanes, container: .board, isWithinBoard: false, modifiers: none) == .copy)
     }
 
     @Test("⌥ forces copy and ⌘ forces move, each a no-op where it is already the default")
     func modifiersOverride() {
-        #expect(DragLocality.operation(kind: .cards, side: .live, isWithinBoard: true, modifiers: option) == .copy)
+        #expect(DragLocality.operation(kind: .cards, container: .board, isWithinBoard: true, modifiers: option) == .copy)
-        #expect(DragLocality.operation(kind: .cards, side: .live, isWithinBoard: false, modifiers: command) == .move)
+        #expect(DragLocality.operation(kind: .cards, container: .board, isWithinBoard: false, modifiers: command) == .move)
         // The no-ops.
-        #expect(DragLocality.operation(kind: .cards, side: .live, isWithinBoard: true, modifiers: command) == .move)
+        #expect(DragLocality.operation(kind: .cards, container: .board, isWithinBoard: true, modifiers: command) == .move)
-        #expect(DragLocality.operation(kind: .cards, side: .live, isWithinBoard: false, modifiers: option) == .copy)
+        #expect(DragLocality.operation(kind: .cards, container: .board, isWithinBoard: false, modifiers: option) == .copy)
     }
 
     @Test("⌘ wins over ⌥ when both are held")
     func commandWinsOverOption() {
         // Finder's own reduction, and the same precedence `ClickModifier.current` applies to clicks.
         #expect(DragLocality.operation(
-            kind: .cards, side: .live, isWithinBoard: false, modifiers: [.option, .command]) == .move)
+            kind: .cards, container: .board, isWithinBoard: false, modifiers: [.option, .command]) == .move)
     }
 
     /// The first carve-out: "Lane drags never copy *within their board*. ⌥ is simply ignored there:
@@ -122,13 +122,13 @@ struct DragLocalityTests {
     func laneDragsNeverCopyWithinTheirBoard() {
         for modifiers in [none, option, command, [.option, .command] as NSEvent.ModifierFlags] {
             #expect(
-                DragLocality.operation(kind: .lanes, side: .live, isWithinBoard: true, modifiers: modifiers) == .move,
+                DragLocality.operation(kind: .lanes, container: .board, isWithinBoard: true, modifiers: modifiers) == .move,
                 "a within-board lane drag is a reorder whatever is held"
             )
         }
         // Across boards the lane obeys the ordinary grammar again.
-        #expect(DragLocality.operation(kind: .lanes, side: .live, isWithinBoard: false, modifiers: option) == .copy)
+        #expect(DragLocality.operation(kind: .lanes, container: .board, isWithinBoard: false, modifiers: option) == .copy)
-        #expect(DragLocality.operation(kind: .lanes, side: .live, isWithinBoard: false, modifiers: command) == .move)
+        #expect(DragLocality.operation(kind: .lanes, container: .board, isWithinBoard: false, modifiers: command) == .move)
     }
 
     /// The second: a trash row's drag is copy-out grammar (04-interactions.md ▸ The trash). Within its
@@ -137,11 +137,11 @@ struct DragLocalityTests {
     /// live copy either way.
     @Test("A trash row drags as a restore at home and as a copy-out abroad")
     func trashDragDefaults() {
-        #expect(DragLocality.operation(kind: .cards, side: .trashed, isWithinBoard: true, modifiers: none) == .move)
+        #expect(DragLocality.operation(kind: .cards, container: .trash, isWithinBoard: true, modifiers: none) == .move)
-        #expect(DragLocality.operation(kind: .cards, side: .trashed, isWithinBoard: false, modifiers: none) == .copy)
+        #expect(DragLocality.operation(kind: .cards, container: .trash, isWithinBoard: false, modifiers: none) == .copy)
         #expect(DragLocality.operation(
-            kind: .cards, side: .trashed, isWithinBoard: false, modifiers: command) == .move)
+            kind: .cards, container: .trash, isWithinBoard: false, modifiers: command) == .move)
-        #expect(DragLocality.operation(kind: .cards, side: .trashed, isWithinBoard: true, modifiers: option) == .copy)
+        #expect(DragLocality.operation(kind: .cards, container: .trash, isWithinBoard: true, modifiers: option) == .copy)
     }
 }
 
@@ -158,7 +158,7 @@ struct TrashDropTests {
     /// The accepted session, with one clause at a time knocked out by the cases.
     private func accepts(
         kind: DragKind? = .cards,
-        side: Liveness = .live,
+        container: ItemContainer = .board,
         isWithinBoard: Bool = true,
         operation: TransferOperation = .move,
         isTrashShown: Bool = true,
@@ -166,7 +166,7 @@ struct TrashDropTests {
     ) -> Bool {
         TrashDrop.accepts(
             kind: kind,
-            side: side,
+            container: container,
             isWithinBoard: isWithinBoard,
             operation: operation,
             isTrashShown: isTrashShown,
@@ -196,12 +196,12 @@ struct TrashDropTests {
         #expect(!accepts(kind: nil))
     }
 
-    /// A trash row's drag is restore/copy-out grammar; dropped back where it came from it writes
+    /// A trash card's drag is the restore; dropped back where it came from it writes nothing, so it
-    /// nothing, so it never proposes.
+    /// never proposes.
-    @Test("A trash row dropped back on the trash is refused")
+    @Test("A trash card dropped back on the trash is refused")
-    func theTrashedSideIsRefused() {
+    func theTrashContainerIsRefused() {
-        #expect(!accepts(side: .trashed))
+        #expect(!accepts(container: .trash))
-        #expect(!accepts(side: .trashed, isWithinBoard: false))
+        #expect(!accepts(container: .trash, isWithinBoard: false))
     }
 
     /// "No move or paste ever targets the trash": a foreign card delivered into this board's trash
@@ -340,7 +340,7 @@ struct DropSettleTests {
                     .appendingPathComponent($0.id.rawValue, isDirectory: true)
             },
             heights: members.map { _ in 44 },
-            side: .live,
+            container: .board,
             source: store
         )
     }

KanbanTests/DragWriteTests.swift

@@ -16,20 +16,6 @@ import Testing
 
 // MARK: - Fixtures
 
-private func tombstoned(order: String, title: String) -> String {
-    """
-    ---
-    schema: 1
-    title: \(title)
-    order: \(order)
-    created: 2026-01-01T09:00:00Z
-    deleted: 2026-03-03T09:00:00Z
-    ---
-    \(title) body.
-
-    """
-}
-
 /// Three cards in the first lane, one in the second — enough room for a run of two to insert
 /// between siblings without either end being the answer.
 @MainActor
@@ -55,12 +41,12 @@ private enum Foreign {
     static let trashed = "dddddddd-dddd-4ddd-8ddd-dddddddddddd"
 }
 
-/// The board every cross-board test drags *out of*: one lane holding a live card and a tombstoned
+/// The board every cross-board test drags *out of*: one lane holding two cards, plus a card sitting
-/// one, so the lane-copy rule has something to strip and the restore rules have a row to carry.
+/// in the source board's own `.trash/` for the cross-board restore cases.
 ///
-/// `colliding` puts the lane and its live card under identities the **destination** already holds,
+/// `colliding` puts the lane and its first card under identities the **destination** already holds,
-/// which is the import boundary's whole question; the tombstoned card keeps its foreign identity
+/// which is the import boundary's whole question; the second card keeps its foreign identity either
-/// either way, so a colliding arrival can prove the degradation is per folder.
+/// way, so a colliding arrival can prove the degradation is per folder.
 @MainActor
 private func makeSourceBoard(colliding: Bool = false) throws -> WriterFixture {
     let fixture = try WriterFixture()
@@ -69,7 +55,8 @@ private func makeSourceBoard(colliding: Bool = false) throws -> WriterFixture {
     let cardName = colliding ? Ident.card1 : Foreign.card
     try fixture.item(laneName, Item.rich(order: "1024", title: "Imported"))
     try fixture.item("\(laneName)/\(cardName)", Item.rich(order: "1024", title: "Travelling"))
-    try fixture.item("\(laneName)/\(Foreign.trashed)", tombstoned(order: "2048", title: "Trashed"))
+    try fixture.item("\(laneName)/\(Foreign.second)", Item.rich(order: "2048", title: "Second"))
+    try fixture.item(".trash/\(Foreign.trashed)", Item.rich(order: "1024", title: "Trashed"))
     return fixture
 }
 
@@ -90,14 +77,14 @@ private func loaded(_ fixture: WriterFixture) throws -> BoardModel {
 /// A lane's rendered card titles, in display order.
 private func titles(_ laneID: ItemID, in fixture: WriterFixture) throws -> [String] {
     guard let lane = try loaded(fixture).lanes.first(where: { $0.id == laneID }) else { return [] }
-    return lane.cards.filter { !$0.isDeleted }.compactMap(\.title.value)
+    return lane.cards.compactMap(\.title.value)
 }
 
 /// A lane's rendered card folder names, in display order — identity, where titles would not
 /// distinguish an original from its copy.
 private func ids(_ laneID: ItemID, in fixture: WriterFixture) throws -> [String] {
     guard let lane = try loaded(fixture).lanes.first(where: { $0.id == laneID }) else { return [] }
-    return lane.cards.filter { !$0.isDeleted }.map(\.id.rawValue)
+    return lane.cards.map(\.id.rawValue)
 }
 
 private func order(_ fixture: WriterFixture, _ relativePath: String) throws -> FieldValue<Double> {
@@ -183,18 +170,16 @@ struct MoveCardsTests {
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A destination that is gone, tombstoned, or empty of members writes nothing")
+    @Test("A destination that is gone, or a set that names nothing, writes nothing")
     func noOps() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        try fixture.item(Ident.lane3, tombstoned(order: "3072", title: "Gone"))
         let store = try BoardStore(rootURL: fixture.root)
         let stamp = try stat(fixture, "\(Ident.lane1)/\(Ident.card1)")
 
-        store.moveCards([card1], toLane: lane3, at: 0)                              // tombstoned lane
         store.moveCards([card1], toLane: ItemID(rawValue: Ident.indexless), at: 0)  // no such lane
         store.moveCards([], toLane: lane2, at: 0)                                   // nothing dragged
-        store.moveCards([ItemID(rawValue: Ident.indexless)], toLane: lane2, at: 0)  // nothing live
+        store.moveCards([ItemID(rawValue: Ident.indexless)], toLane: lane2, at: 0)  // nothing there
 
         #expect(try stat(fixture, "\(Ident.lane1)/\(Ident.card1)") == stamp)
         #expect(try titles(lane2, in: fixture) == ["Fourth"])
@@ -315,14 +300,13 @@ struct CopyCardsTests {
     func noOps() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        try fixture.item(Ident.lane3, tombstoned(order: "3072", title: "Gone"))
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.copyCards([card1], toLane: lane3, at: 0)
+        store.copyCards([card1], toLane: ItemID(rawValue: Ident.lane3), at: 0)
         store.copyCards([], toLane: lane2, at: 0)
 
         #expect(try titles(lane2, in: fixture) == ["Fourth"])
-        #expect(try fixture.entryNames(Ident.lane3) == ["index.md"])
+        #expect(!fixture.exists(Ident.lane3))
         #expect(store.banners.oneShots.isEmpty)
     }
 }
@@ -411,14 +395,13 @@ struct ReceiveCardsTests {
         defer { destination.tearDown() }
         let source = try makeSourceBoard()
         defer { source.tearDown() }
-        try destination.item(Ident.lane3, tombstoned(order: "3072", title: "Gone"))
         let store = try BoardStore(rootURL: destination.root)
 
         store.receiveCards([source.url("\(Foreign.lane)/\(Foreign.card)")],
-                           operation: .copy, toLane: lane3, at: 0)
+                           operation: .copy, toLane: ItemID(rawValue: Ident.lane3), at: 0)
         store.receiveCards([], operation: .copy, toLane: lane2, at: 0)
 
-        #expect(try destination.entryNames(Ident.lane3) == ["index.md"])
+        #expect(!destination.exists(Ident.lane3))
         #expect(try titles(lane2, in: destination) == ["Fourth"])
         #expect(source.exists("\(Foreign.lane)/\(Foreign.card)"))
         #expect(store.banners.oneShots.isEmpty)
@@ -524,8 +507,12 @@ struct MoveLanesTests {
 @Suite("BoardStore ▸ receiveLanes")
 struct ReceiveLanesTests {
 
-    @Test("A lane copy transfers the content and strips the tombstoned cards")
+    /// 04-interactions.md ▸ Drag and drop, resettled 2026-07-28: "A lane carries exactly its cards —
-    func laneCopyStripsTombstones() throws {
+    /// the trash is board-level (`.trash/`), so there is nothing lane-nested to strip or carry: copy
+    /// and ⌘-drag move alike transfer the lane's folder as it is; the old tombstone-stripping rule is
+    /// retired with the tombstone model."
+    @Test("A lane copy transfers the whole lane, minting fresh identities at every level")
+    func laneCopyRemintsThroughout() throws {
         let destination = try makeBoard()
         defer { destination.tearDown() }
         let source = try makeSourceBoard()
@@ -538,19 +525,15 @@ struct ReceiveLanesTests {
         #expect(model.lanes.map(\.title.value) == ["Imported", "Todo", "Doing"])
         let arrived = try #require(model.lanes.first)
         #expect(arrived.id.rawValue != Foreign.lane, "a copy mints fresh UUIDs at every level")
-        #expect(arrived.cards.map(\.title.value) == ["Travelling"],
+        #expect(arrived.cards.map(\.title.value) == ["Travelling", "Second"], "nothing to strip")
-                "trash isn't content — the tombstoned card did not come")
+        #expect(arrived.cards.allSatisfy { $0.id.rawValue != Foreign.card },
-        #expect(arrived.cards.allSatisfy { !$0.isDeleted })
+                "a copied lane's cards are new cards")
-        #expect(arrived.cards[0].id.rawValue != Foreign.card, "a copied lane's cards are new cards")
+        #expect(model.trash.isEmpty, "the source's trash is board-level and never travels with a lane")
-
-        // The tombstoned original stays recoverable in the source board.
-        #expect(source.exists("\(Foreign.lane)/\(Foreign.trashed)"))
-        #expect(try source.indexText("\(Foreign.lane)/\(Foreign.trashed)").contains("deleted:"))
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A lane move carries its tombstoned cards whole, into the destination's trash")
+    @Test("A lane move carries its cards whole, identity and all")
-    func laneMoveCarriesTombstones() throws {
+    func laneMoveCarriesItsCards() throws {
         let destination = try makeBoard()
         defer { destination.tearDown() }
         let source = try makeSourceBoard()
@@ -563,10 +546,9 @@ struct ReceiveLanesTests {
         #expect(model.lanes.map(\.id.rawValue) == [Ident.lane1, Ident.lane2, Foreign.lane],
                 "identity travels, and the drop position is honoured")
         let arrived = try #require(model.lanes.last)
-        #expect(arrived.cards.map(\.id.rawValue) == [Foreign.card, Foreign.trashed])
+        #expect(arrived.cards.map(\.id.rawValue) == [Foreign.card, Foreign.second],
-        #expect(arrived.cards[1].isDeleted, "the tombstone came along as-is")
+                "a lane carries exactly its cards: nothing lane-nested to strip or carry")
-        #expect(TrashModel.entries(of: model).map(\.id) == [ItemID(rawValue: Foreign.trashed)],
+        #expect(model.trash.isEmpty, "and nothing arrived in the destination's own trash")
-                "and it renders in the destination's trash")
         #expect(!source.exists(Foreign.lane))
         #expect(store.banners.oneShots.isEmpty)
     }
@@ -591,7 +573,7 @@ struct ReceiveLanesTests {
         let arrivedCards = arrived.cards.map(\.id.rawValue)
         #expect(arrivedCards.count == 2)
         #expect(arrivedCards[0] != Ident.card1, "the colliding card was repaired too")
-        #expect(arrivedCards[1] == Foreign.trashed, "and nothing else was — degradation is per folder")
+        #expect(arrivedCards[1] == Foreign.second, "and nothing else was — degradation is per folder")
         #expect(try titles(lane1, in: destination) == ["First", "Second", "Third"],
                 "the residents kept their identities and their ranks")
     }
@@ -609,26 +591,37 @@ struct ReceiveLanesTests {
     }
 }
 
-// MARK: - Drag to restore, positionally
+// MARK: - Restore is an ordinary move out
 
-/// A lane holding a live card, a tombstoned one, and another live one — so a restore has somewhere
+/// A lane holding two cards, plus one card in the board's `.trash/` — so a restore has somewhere to
-/// to land that is neither the head nor the tail.
+/// land that is neither the head nor the tail.
+///
+/// **There is no tombstone anywhere in it.** "Restoring is an ordinary move out: drag a trash card
+/// into any lane at any position … there is no restore-specific machinery and no Put Back"
+/// (03-board-ui.md § Trash, resettled 2026-07-28), so the fixture is an ordinary board plus a
+/// reserved folder.
 @MainActor
 private func makeTrashBoard() throws -> WriterFixture {
     let fixture = try WriterFixture()
     try fixture.item("", Item.board)
     try fixture.item(Ident.lane1, Item.rich(order: "1024", title: "Todo"))
     try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "First"))
-    try fixture.item("\(Ident.lane1)/\(Ident.card2)", tombstoned(order: "2048", title: "Trashed"))
     try fixture.item("\(Ident.lane1)/\(Ident.card3)", Item.rich(order: "3072", title: "Third"))
     try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Doing"))
     try fixture.item("\(Ident.lane2)/\(Ident.card4)", Item.rich(order: "1024", title: "Fourth"))
+    try fixture.item(".trash/\(Ident.card2)", Item.rich(order: "1024", title: "Trashed"))
     return fixture
 }
 
+/// Restoring out of the trash — **through `moveCards` and `copyCards`, with no method of its own**.
+///
+/// That is the claim these tests exist to pin. The tombstone model needed `restoreByDrag` and
+/// `receiveRestoredCards` because a restore had to clear a key as well as place a rank; a
+/// materialized trash makes it "an ordinary move" (03-board-ui.md § Trash), so the ordinary drop
+/// commits take a trash-side source and the retired pair is gone.
 @MainActor
-@Suite("BoardStore ▸ positional drag-to-restore")
+@Suite("BoardStore ▸ restore by move-out")
-struct RestoreByDragPositionTests {
+struct RestoreByMoveOutTests {
 
     @Test("The drop position sets the restored card's order")
     func dropPositionSetsTheOrder() throws {
@@ -636,76 +629,89 @@ struct RestoreByDragPositionTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        // Index 0 among the lane's two live cards: ahead of both, not back at its recorded 2048.
+        // Index 0 among the lane's two cards: ahead of both.
-        store.restoreByDrag(cardID: card2, intoLane: lane1, at: 0)
+        store.moveCards([card2], toLane: lane1, at: 0)
 
         #expect(try titles(lane1, in: fixture) == ["Trashed", "First", "Third"])
         #expect(try order(fixture, "\(Ident.lane1)/\(Ident.card2)") == .valid(0))
-        #expect(fixture.exists("\(Ident.lane1)/\(Ident.card2)"), "same lane never moves a folder")
+        #expect(!fixture.exists(".trash/\(Ident.card2)"), "the folder physically left the trash")
-        #expect(TrashModel.isEmpty(try loaded(fixture)))
+        #expect(try loaded(fixture).trash.isEmpty)
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A cross-lane restore lands at the drop position, not at the bottom")
-    func crossLanePositional() throws {
-        let fixture = try makeTrashBoard()
-        defer { fixture.tearDown() }
-        let store = try BoardStore(rootURL: fixture.root)
-
-        store.restoreByDrag(cardID: card2, intoLane: lane2, at: 0)
-
-        #expect(try titles(lane2, in: fixture) == ["Trashed", "Fourth"])
-        #expect(!fixture.exists("\(Ident.lane1)/\(Ident.card2)"))
-        #expect(try order(fixture, "\(Ident.lane2)/\(Ident.card2)") == .valid(0))
-        let text = try fixture.indexText("\(Ident.lane2)/\(Ident.card2)")
-        #expect(!text.contains("deleted:"))
-    }
-
     @Test("An out-of-range index clamps to the lane's bottom")
     func indexClamps() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.restoreByDrag(cardID: card2, intoLane: lane1, at: 99)
+        store.moveCards([card2], toLane: lane1, at: 99)
 
         #expect(try titles(lane1, in: fixture) == ["First", "Third", "Trashed"])
         #expect(try order(fixture, "\(Ident.lane1)/\(Ident.card2)") == .valid(4096))
     }
 
-    @Test("A multi-row restore lands the run contiguously, in drop order, in one bracket")
+    @Test("The identity travels, exactly as it does for any move")
+    func identityTravels() throws {
+        let fixture = try makeTrashBoard()
+        defer { fixture.tearDown() }
+        let store = try BoardStore(rootURL: fixture.root)
+
+        store.moveCards([card2], toLane: lane2, at: 0)
+
+        #expect(try ids(lane2, in: fixture) == [Ident.card2, Ident.card4])
+        #expect(!fixture.exists(".trash/\(Ident.card2)"))
+        // Nothing about the restored card says it was ever deleted: there is no key to remove,
+        // because there is no key.
+        #expect(!(try fixture.indexText("\(Ident.lane2)/\(Ident.card2)").contains("deleted:")))
+    }
+
+    @Test("A multi-card restore lands the run contiguously, in one bracket")
     func multiRestore() throws {
         let fixture = try WriterFixture()
         defer { fixture.tearDown() }
         try fixture.item("", Item.board)
         try fixture.item(Ident.lane1, Item.rich(order: "1024", title: "Todo"))
         try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "First"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)", tombstoned(order: "2048", title: "TrashedA"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card3)", tombstoned(order: "3072", title: "TrashedB"))
         try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Doing"))
         try fixture.item("\(Ident.lane2)/\(Ident.card4)", Item.rich(order: "1024", title: "Fourth"))
+        // The trash's own order is its display order — `card3` above `card2`, newest-first.
+        try fixture.item(".trash/\(Ident.card2)", Item.rich(order: "2048", title: "TrashedA"))
+        try fixture.item(".trash/\(Ident.card3)", Item.rich(order: "1024", title: "TrashedB"))
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.restoreByDrag(cardIDs: [card3, card2], intoLane: lane2, at: 0)
+        store.moveCards([card3, card2], toLane: lane2, at: 0)
 
         #expect(try titles(lane2, in: fixture) == ["TrashedB", "TrashedA", "Fourth"],
-                "the payload's order is the landing order")
+                "the trash's own order is the landing order")
-        #expect(TrashModel.isEmpty(try loaded(fixture)))
+        #expect(try loaded(fixture).trash.isEmpty)
-        #expect(!fixture.exists("\(Ident.lane1)/\(Ident.card2)"))
-        #expect(!fixture.exists("\(Ident.lane1)/\(Ident.card3)"))
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A row that is not a trash row is skipped, and an empty list writes nothing")
+    @Test("⌥ copies out and leaves the original in the trash")
-    func skipsWhatIsNotARow() throws {
+    func copyOutLeavesTheOriginal() throws {
+        let fixture = try makeTrashBoard()
+        defer { fixture.tearDown() }
+        let store = try BoardStore(rootURL: fixture.root)
+
+        store.copyCards([card2], toLane: lane2, at: 0)
+
+        #expect(try titles(lane2, in: fixture) == ["Trashed", "Fourth"])
+        let landed = try #require(try ids(lane2, in: fixture).first)
+        #expect(landed != Ident.card2, "a copy out of the trash is still a copy")
+        #expect(fixture.exists(".trash/\(Ident.card2)"), "the original stays in the trash")
+        #expect(try loaded(fixture).trash.count == 1)
+    }
+
+    @Test("A card that is not in the trash and an empty list both write nothing")
+    func skipsWhatIsNotThere() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
         let untouched = try stat(fixture, "\(Ident.lane1)/\(Ident.card1)")
 
-        // `card1` is live — it has no trash row to drag — and `indexless` names nothing.
+        store.moveCards([ItemID(rawValue: Ident.indexless)], toLane: lane2, at: 0)
-        store.restoreByDrag(cardIDs: [card1, ItemID(rawValue: Ident.indexless)], intoLane: lane2, at: 0)
+        store.moveCards([], toLane: lane2, at: 0)
-        store.restoreByDrag(cardIDs: [], intoLane: lane2, at: 0)
 
         #expect(try titles(lane2, in: fixture) == ["Fourth"])
         #expect(try stat(fixture, "\(Ident.lane1)/\(Ident.card1)") == untouched)
@@ -713,52 +719,49 @@ struct RestoreByDragPositionTests {
     }
 }
 
+/// The cross-board half — **`receiveCards`, with no restore variant** (04-interactions.md ▸ The
+/// trash: "Dropped on *another* board it follows the copy default — a live copy lands there, the
+/// original stays in the source trash; ⌘-drag forces the true cross-board restore-move").
 @MainActor
-@Suite("BoardStore ▸ receiveRestoredCards")
+@Suite("BoardStore ▸ cross-board restore")
-struct ReceiveRestoredCardsTests {
+struct CrossBoardRestoreTests {
 
-    @Test("A cross-board restore-copy lands live and leaves the source tombstone standing")
+    @Test("A cross-board copy out of the trash lands a fresh identity and leaves the original")
-    func restoreCopyStripsDeletedAndKeepsTheOriginal() throws {
+    func copyLeavesTheOriginal() throws {
         let destination = try makeBoard()
         defer { destination.tearDown() }
         let source = try makeSourceBoard()
         defer { source.tearDown() }
         let store = try BoardStore(rootURL: destination.root)
 
-        store.receiveRestoredCards([source.url("\(Foreign.lane)/\(Foreign.trashed)")],
+        store.receiveCards([source.url(".trash/\(Foreign.trashed)")],
                            operation: .copy, toLane: lane2, at: 0)
 
         #expect(try titles(lane2, in: destination) == ["Trashed", "Fourth"])
-        let landedIDs = try ids(lane2, in: destination)
+        let landed = try #require(try ids(lane2, in: destination).first)
-        let landed = try #require(landedIDs.first)
         #expect(landed != Foreign.trashed, "a copy out of the trash is still a copy")
         let text = try destination.indexText("\(Ident.lane2)/\(landed)")
-        #expect(!text.contains("deleted:"), "`deleted:` is stripped on paste/duplicate/drop")
         #expect(text.contains("created: 2026-01-01T09:00:00Z"), "a copy is a fork")
 
-        // The tombstoned original stays recoverable in the source board's trash.
+        #expect(source.exists(".trash/\(Foreign.trashed)"), "the original stays in the source trash")
-        #expect(source.exists("\(Foreign.lane)/\(Foreign.trashed)"))
-        #expect(try source.indexText("\(Foreign.lane)/\(Foreign.trashed)").contains("deleted:"))
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A cross-board restore-move clears the tombstone and the source loses the folder")
+    @Test("A ⌘-drag move out of another board's trash carries the identity and empties it")
-    func restoreMoveClearsTheTombstone() throws {
+    func moveCarriesTheIdentity() throws {
         let destination = try makeBoard()
         defer { destination.tearDown() }
         let source = try makeSourceBoard()
         defer { source.tearDown() }
         let store = try BoardStore(rootURL: destination.root)
 
-        store.receiveRestoredCards([source.url("\(Foreign.lane)/\(Foreign.trashed)")],
+        store.receiveCards([source.url(".trash/\(Foreign.trashed)")],
                            operation: .move, toLane: lane2, at: 1)
 
         #expect(try ids(lane2, in: destination) == [Ident.card4, Foreign.trashed], "identity travels")
-        let text = try destination.indexText("\(Ident.lane2)/\(Foreign.trashed)")
+        #expect(!source.exists(".trash/\(Foreign.trashed)"), "the card left the source trash")
-        #expect(!text.contains("deleted:"))
+        #expect(try loaded(source).trash.isEmpty)
-        #expect(!source.exists("\(Foreign.lane)/\(Foreign.trashed)"), "the tombstone left the source")
+        #expect(try loaded(destination).trash.isEmpty)
-        #expect(TrashModel.isEmpty(try loaded(source)))
-        #expect(TrashModel.isEmpty(try loaded(destination)))
         #expect(store.banners.oneShots.isEmpty)
     }
 }

KanbanTests/FileDropWriteTests.swift

@@ -184,27 +184,25 @@ struct ImportAttachmentsToCardTests {
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A tombstoned, ancestor-tombstoned, or vanished target writes nothing")
+    @Test("A trashed or vanished target writes nothing")
     func inertTargets() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let sources = try DropSources()
         defer { sources.tearDown() }
-        // A tombstoned card, and a live card under a tombstoned lane — effective liveness is
+        // "Finder file drops on trash cards are inert" (04 ▸ The trash), and a card whose lane was
-        // ancestor-walked, so both render nowhere and both are inert.
+        // deleted is simply not there.
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)", tombstoned(order: "2048", title: "Second"))
+        try fixture.move("\(Ident.lane1)/\(Ident.card2)", toTrash: Ident.card2)
-        try fixture.item(Ident.lane3, tombstoned(order: "3072", title: "Gone"))
-        try fixture.item("\(Ident.lane3)/\(Ident.card4)", Item.rich(order: "1024", title: "Buried"))
         let store = try BoardStore(rootURL: fixture.root)
         let shot = try sources.file("shot.png")
 
-        store.importAttachments([shot], toCard: card2)                              // tombstoned card
+        store.importAttachments([shot], toCard: card2)                              // a trash card
-        store.importAttachments([shot], toCard: ItemID(rawValue: Ident.card4))      // under a tombstoned lane
+        store.importAttachments([shot], toCard: ItemID(rawValue: Ident.card4))      // its lane is gone
         store.importAttachments([shot], toCard: ItemID(rawValue: Ident.indexless))  // no such card
         store.importAttachments([shot], toCard: lane1)                              // a lane, not a card
         store.importAttachments([], toCard: card1)                                  // nothing dropped
 
-        #expect(!fixture.exists("\(Ident.lane1)/\(Ident.card2)/attachments"))
+        #expect(!fixture.exists(".trash/\(Ident.card2)/attachments"))
         #expect(!fixture.exists("\(Ident.lane3)/\(Ident.card4)/attachments"))
         #expect(!fixture.exists("\(Ident.lane1)/attachments"))
         #expect(!fixture.exists("\(Ident.lane1)/\(Ident.card1)/attachments"))
@@ -387,21 +385,20 @@ struct CreateCardsFromFilesTests {
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A tombstoned, vanished, or empty destination writes nothing")
+    @Test("A deleted, vanished, or empty destination writes nothing")
     func inertDestinations() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let sources = try DropSources()
         defer { sources.tearDown() }
-        try fixture.item(Ident.lane3, tombstoned(order: "3072", title: "Gone"))
         let store = try BoardStore(rootURL: fixture.root)
         let shot = try sources.file("shot.png")
 
-        store.createCards(fromFiles: [shot], inLane: lane3, at: 0)                              // tombstoned
+        store.createCards(fromFiles: [shot], inLane: lane3, at: 0)                              // no such lane
         store.createCards(fromFiles: [shot], inLane: ItemID(rawValue: Ident.indexless), at: 0)  // no such lane
         store.createCards(fromFiles: [], inLane: lane1, at: 0)                                  // nothing dropped
 
-        #expect(try fixture.entryNames(Ident.lane3) == ["index.md"])
+        #expect(!fixture.exists(Ident.lane3))
         #expect(try titles(lane1, in: fixture) == ["First", "Second", "Third"])
         #expect(store.banners.oneShots.isEmpty)
     }

KanbanTests/InlineEditWriteTests.swift

@@ -220,21 +220,21 @@ struct InlineRenameWriteTests {
         #expect(store.banners.oneShots.isEmpty)
     }
 
-    @Test("A commit at a card under a tombstoned lane writes nothing — liveness is effective")
+    @Test("A commit at a card that entered the trash writes nothing")
-    func targetUnderATombstonedLaneWritesNothing() throws {
+    func targetInTheTrashWritesNothing() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        // The lane carries the tombstone; the card's own flag is untouched, and it renders nowhere
+        // "Entering the trash is a vanish from the board; nothing is ever written into a vanished
-        // regardless (03-board-ui.md collapses the lane to one trash entry).
+        // folder" (04 ▸ Grammar).
-        try fixture.item(Ident.lane1, tombstoned(order: "1024", title: "Todo"))
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
         let store = try BoardStore(rootURL: fixture.root)
-        let before = try fixture.indexData("\(Ident.lane1)/\(Ident.card1)")
+        let before = try fixture.indexData(".trash/\(Ident.card1)")
 
         store.transient.beginRename(of: card1, currentTitle: "First")
         store.transient.updateRenameDraft("Never lands")
         store.commitRename()
 
-        #expect(try fixture.indexData("\(Ident.lane1)/\(Ident.card1)") == before)
+        #expect(try fixture.indexData(".trash/\(Ident.card1)") == before)
         #expect(store.banners.oneShots.isEmpty)
     }
 

KanbanTests/KeyboardGrammarTests.swift

@@ -75,9 +75,9 @@ private func target(
     width: CGFloat = 100,
     height: CGFloat = 100,
     kind: SelectionKind = .card,
-    side: Liveness = .live
+    container: ItemContainer = .board
 ) -> MarqueeTarget {
-    MarqueeTarget(id: id, kind: kind, side: side, frame: CGRect(x: x, y: y, width: width, height: height))
+    MarqueeTarget(id: id, kind: kind, container: container, frame: CGRect(x: x, y: y, width: width, height: height))
 }
 
 /// A two-by-two grid: `card1` `card3` on the top row, `card2` `card4` beneath them — the smallest
@@ -145,7 +145,7 @@ struct NavigationMathTests {
 
     @Test("The predicate is the ⇧-arrow's restriction — the trash side is simply not a candidate")
     func predicateRestrictsCandidates() {
-        let trashed = target(card2, x: 0, y: 100, side: .trashed)
+        let trashed = target(card2, x: 0, y: 100, container: .trash)
         let live = target(card3, x: 0, y: 400)
         let all = [trashed, live]
 
@@ -154,7 +154,7 @@ struct NavigationMathTests {
             "a plain arrow walks across the boundary"
         )
         #expect(
-            NavigationMath.nearest(from: originFrame, direction: .down, among: all, where: { $0.side == .live }) == card3
+            NavigationMath.nearest(from: originFrame, direction: .down, among: all, where: { $0.container == .board }) == card3
         )
     }
 }
@@ -216,10 +216,10 @@ struct SuccessorTests {
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        #expect(SelectionGrammar.successor(afterDeleting: [card2], in: snapshot) == card3)
+        #expect(SelectionGrammar.successor(afterDeleting: [card2], snapshot: snapshot) == card3)
-        #expect(SelectionGrammar.successor(afterDeleting: [card1], in: snapshot) == card2)
+        #expect(SelectionGrammar.successor(afterDeleting: [card1], snapshot: snapshot) == card2)
         #expect(
-            SelectionGrammar.successor(afterDeleting: [card1, card2], in: snapshot) == card3,
+            SelectionGrammar.successor(afterDeleting: [card1, card2], snapshot: snapshot) == card3,
             "a block's successor is the first survivor after its last member"
         )
     }
@@ -230,8 +230,8 @@ struct SuccessorTests {
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        #expect(SelectionGrammar.successor(afterDeleting: [card4], in: snapshot) == card3)
+        #expect(SelectionGrammar.successor(afterDeleting: [card4], snapshot: snapshot) == card3)
-        #expect(SelectionGrammar.successor(afterDeleting: [card3, card4], in: snapshot) == card2)
+        #expect(SelectionGrammar.successor(afterDeleting: [card3, card4], snapshot: snapshot) == card2)
     }
 
     @Test("A survivor between the members is found forwards first")
@@ -242,7 +242,7 @@ struct SuccessorTests {
 
         // Doomed at positions 0 and 2: forward from the last one finds card4, which is what makes
         // repeated ⌫ keep moving down rather than bouncing back up the lane.
-        #expect(SelectionGrammar.successor(afterDeleting: [card1, card3], in: snapshot) == card4)
+        #expect(SelectionGrammar.successor(afterDeleting: [card1, card3], snapshot: snapshot) == card4)
     }
 
     @Test("An emptied container selects nothing")
@@ -251,10 +251,10 @@ struct SuccessorTests {
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        #expect(SelectionGrammar.successor(afterDeleting: [card1, card2, card3, card4], in: snapshot) == nil)
+        #expect(SelectionGrammar.successor(afterDeleting: [card1, card2, card3, card4], snapshot: snapshot) == nil)
-        #expect(SelectionGrammar.successor(afterDeleting: [], in: snapshot) == nil)
+        #expect(SelectionGrammar.successor(afterDeleting: [], snapshot: snapshot) == nil)
         #expect(
-            SelectionGrammar.successor(afterDeleting: [ItemID(rawValue: "nobody")], in: snapshot) == nil,
+            SelectionGrammar.successor(afterDeleting: [ItemID(rawValue: "nobody")], snapshot: snapshot) == nil,
             "ids naming nothing name no container either"
         )
     }
@@ -267,7 +267,7 @@ struct SuccessorTests {
 
         // card5 is later than card2 in flatten order (lane `order`, then card `order`), so the
         // container is lane2 — the same "last member" anchor ⌘N and paste already share.
-        #expect(SelectionGrammar.successor(afterDeleting: [card2, card5], in: snapshot) == card6)
+        #expect(SelectionGrammar.successor(afterDeleting: [card2, card5], snapshot: snapshot) == card6)
     }
 
     @Test("Lanes follow the same rule in the live lane order")
@@ -276,9 +276,9 @@ struct SuccessorTests {
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        #expect(SelectionGrammar.successor(afterDeleting: [lane1], in: snapshot) == lane2)
+        #expect(SelectionGrammar.successor(afterDeleting: [lane1], snapshot: snapshot) == lane2)
-        #expect(SelectionGrammar.successor(afterDeleting: [lane3], in: snapshot) == lane2, "the last lane's predecessor")
+        #expect(SelectionGrammar.successor(afterDeleting: [lane3], snapshot: snapshot) == lane2, "the last lane's predecessor")
-        #expect(SelectionGrammar.successor(afterDeleting: [lane1, lane2, lane3], in: snapshot) == nil)
+        #expect(SelectionGrammar.successor(afterDeleting: [lane1, lane2, lane3], snapshot: snapshot) == nil)
     }
 
     @Test("⌫ selects the successor immediately, before the reload echoes the tombstone back")
@@ -287,7 +287,7 @@ struct SuccessorTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card2], liveness: .live)
+        store.select([card2], in: .board)
         store.deleteSelection()
 
         #expect(store.selection.ids == [card3])
@@ -306,7 +306,7 @@ struct SuccessorTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card5, card6], liveness: .live)
+        store.select([card5, card6], in: .board)
         store.deleteSelection()
 
         #expect(store.selection.isEmpty)
@@ -324,13 +324,13 @@ struct SelectionHeadTests {
     func headDefaults() throws {
         let state = TransientBoardState()
 
-        state.select([card1], liveness: .live)
+        state.select([card1], in: .board)
         #expect(state.selectionHead == card1)
 
-        state.select([card1, card2], liveness: .live)
+        state.select([card1, card2], in: .board)
         #expect(state.selectionHead == nil, "a set with no gesture behind it names no cursor")
 
-        state.select([card1, card2], liveness: .live, anchor: card1, head: card2)
+        state.select([card1, card2], in: .board, anchor: card1, head: card2)
         #expect(state.selectionAnchor == card1)
         #expect(state.selectionHead == card2, "an explicit head is kept whatever the count")
 
@@ -346,9 +346,9 @@ struct SelectionHeadTests {
         let snapshot = try load(fixture)
 
         let outcome = SelectionGrammar.click(
-            SelectionTarget(id: card3, kind: .card, side: .live),
+            SelectionTarget(id: card3, kind: .card, container: .board),
             modifier: .shift,
-            selection: ItemReferenceSet(ids: [card1], liveness: .live),
+            selection: ItemReferenceSet(ids: [card1], container: .board),
             anchor: card1,
             snapshot: snapshot
         )
@@ -364,7 +364,7 @@ struct SelectionHeadTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card1, card2], liveness: .live, anchor: card1, head: card2)
+        store.select([card1, card2], in: .board, anchor: card1, head: card2)
 
         try FileManager.default.removeItem(at: fixture.url("\(Ident.lane1)/\(Ident.card2)"))
         store.handleWatcherEvent(.treeChanged(.foreign))
@@ -375,25 +375,16 @@ struct SelectionHeadTests {
         #expect(store.transient.selectionAnchor == card1, "the anchor survived — it is still in the tree")
     }
 
-    @Test("A liveness flip is a vanish for the head too")
+    @Test("A container crossing is a vanish for the head too")
-    func resolveDropsALivenessFlippedHead() async throws {
+    func resolveDropsAContainerCrossedHead() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
         #expect(store.transient.selectionHead == card1)
 
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", """
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
-        ---
-        schema: 1
-        title: First
-        order: 1024
-        deleted: 2026-03-03T09:00:00Z
-        ---
-        First body.
-
-        """)
         store.handleWatcherEvent(.treeChanged(.foreign))
         await store.awaitQuiescence()
 
@@ -416,7 +407,7 @@ struct SortWriteTests {
         let untouchedFirst = try fixture.indexText("\(Ident.lane1)/\(Ident.card1)")
         let untouchedFourth = try fixture.indexText("\(Ident.lane1)/\(Ident.card4)")
 
-        store.select([card3], liveness: .live)
+        store.select([card3], in: .board)
         store.sortSelection(.up)
 
         #expect(try cardOrder(Ident.lane1, in: fixture) == [card1, card3, card2, card4])
@@ -435,7 +426,7 @@ struct SortWriteTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card2, card4], liveness: .live)
+        store.select([card2, card4], in: .board)
         store.sortSelection(.up)
 
         #expect(try cardOrder(Ident.lane1, in: fixture) == [card1, card2, card4, card3])
@@ -447,7 +438,7 @@ struct SortWriteTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card1, card2], liveness: .live)
+        store.select([card1, card2], in: .board)
         store.sortSelection(.down)
 
         #expect(try cardOrder(Ident.lane1, in: fixture) == [card3, card1, card2, card4])
@@ -467,7 +458,7 @@ struct SortWriteTests {
 
         #expect(try cardOrder(Ident.lane1, in: fixture) == [card1, card2])
 
-        store.select([card2], liveness: .live)
+        store.select([card2], in: .board)
         store.sortSelection(.up)
 
         #expect(try cardOrder(Ident.lane1, in: fixture) == [card2, card1])
@@ -482,16 +473,16 @@ struct SortWriteTests {
 
         #expect(store.sortPlan(.up) == nil, "nothing selected")
 
-        store.select([lane1], liveness: .live)
+        store.select([lane1], in: .board)
         #expect(store.sortPlan(.up) == nil, "a lane selection — ⌥⌘↑/⌥⌘↓ are inert on lanes")
 
-        store.select([card2, card5], liveness: .live)
+        store.select([card2, card5], in: .board)
         #expect(store.sortPlan(.up) == nil, "a card selection spanning lanes — cards never change lanes by ⌘-arrow")
 
-        store.select([card1], liveness: .trashed)
+        store.select([card1], in: .trash)
         #expect(store.sortPlan(.up) == nil, "a tombstoned selection")
 
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
         #expect(store.sortPlan(.up) == nil, "already at the top")
         #expect(store.sortPlan(.down) != nil, "but the other direction is live")
     }
@@ -513,7 +504,7 @@ struct MoveLaneConventionTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        let lanes = SelectionGrammar.liveLanes(in: store.snapshot)
+        let lanes = SelectionGrammar.lanes(in: store.snapshot)
         #expect(lanes == [lane1, lane2, lane3])
         let from = try #require(lanes.firstIndex(of: lane2))
 
@@ -527,7 +518,7 @@ struct MoveLaneConventionTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        let lanes = SelectionGrammar.liveLanes(in: store.snapshot)
+        let lanes = SelectionGrammar.lanes(in: store.snapshot)
         let from = try #require(lanes.firstIndex(of: lane1))
 
         store.moveLane(lane1, toIndex: from + 1)

KanbanTests/LooseFileRelocationTests.swift

@@ -665,9 +665,9 @@ struct LooseFilePasteTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([ItemID(rawValue: Ident.card1)], liveness: .live)
+        harness.store.select([ItemID(rawValue: Ident.card1)], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([ItemID(rawValue: Ident.lane4)], liveness: .live)
+        target.select([ItemID(rawValue: Ident.lane4)], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let arrived = try arrivedCard(in: destination)
@@ -693,9 +693,9 @@ struct LooseFilePasteTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([ItemID(rawValue: Ident.card1)], liveness: .live)
+        harness.store.select([ItemID(rawValue: Ident.card1)], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([ItemID(rawValue: Ident.lane4)], liveness: .live)
+        target.select([ItemID(rawValue: Ident.lane4)], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let arrived = try arrivedCard(in: destination)
@@ -718,9 +718,9 @@ struct LooseFilePasteTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([ItemID(rawValue: Ident.card1)], liveness: .live)
+        harness.store.select([ItemID(rawValue: Ident.card1)], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([ItemID(rawValue: Ident.lane4)], liveness: .live)
+        target.select([ItemID(rawValue: Ident.lane4)], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(harness.fixture.exists("\(cardPath)/notes.txt"))
@@ -735,7 +735,7 @@ struct LooseFilePasteTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([ItemID(rawValue: Ident.lane1)], liveness: .live)
+        harness.store.select([ItemID(rawValue: Ident.lane1)], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.paste(into: target)?.value
 
@@ -760,7 +760,7 @@ struct LooseFilePasteTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([ItemID(rawValue: Ident.card1)], liveness: .live)
+        harness.store.select([ItemID(rawValue: Ident.card1)], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         // The snapshot goes missing between the copy and the paste — 04's degraded paste.
@@ -768,7 +768,7 @@ struct LooseFilePasteTests {
             try FileManager.default.removeItem(at: harness.staging.appendingPathComponent(staged))
         }
 
-        target.select([ItemID(rawValue: Ident.lane4)], liveness: .live)
+        target.select([ItemID(rawValue: Ident.lane4)], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let arrived = try arrivedCard(in: destination)

KanbanTests/NewCardTargetTests.swift

@@ -38,7 +38,6 @@ private func makeBoard() throws -> WriterFixture {
     try fixture.item("\(Ident.lane1)/\(Ident.card2)", Item.rich(order: "2048", title: "Second"))
     try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Doing"))
     try fixture.item("\(Ident.lane2)/\(Ident.card3)", Item.rich(order: "1024", title: "Third"))
-    try fixture.item(Ident.lane3, tombstoned(order: "3072", title: "Archive"))
     return fixture
 }
 
@@ -71,14 +70,14 @@ struct NewCardTargetTests {
 
         // "With a card selected, the new card is created in that card's lane, immediately after it
         // (paste-anchor consistency)."
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card1], liveness: .live))
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card1], container: .board))
             == NewCardTarget.Resolution(laneID: lane1, anchorCardID: card1))
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card3], liveness: .live))
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card3], container: .board))
             == NewCardTarget.Resolution(laneID: lane2, anchorCardID: card3))
 
         // The last card in a lane is still an anchor here — "after the last card" and "at the
         // bottom" coincide, and it is the commit that notices (`BoardStore.insertionIndex`).
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card2], liveness: .live))
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card2], container: .board))
             == NewCardTarget.Resolution(laneID: lane1, anchorCardID: card2))
     }
 
@@ -89,7 +88,7 @@ struct NewCardTargetTests {
         let snapshot = try BoardLoader.load(boardRoot: fixture.root).model
 
         // "With a lane selected, appended at its bottom (Return consistency)."
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [lane2], liveness: .live))
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [lane2], container: .board))
             == NewCardTarget.Resolution(laneID: lane2, anchorCardID: nil))
     }
 
@@ -107,25 +106,25 @@ struct NewCardTargetTests {
         #expect(resolve(snapshot) == NewCardTarget.Resolution(laneID: lane1, anchorCardID: nil))
         #expect(resolve(snapshot, lastActive: ItemID(rawValue: Ident.indexless))
             == NewCardTarget.Resolution(laneID: lane1, anchorCardID: nil))
-        // A *tombstoned* lane is not a target either — it renders nowhere, and the trash is never a
+        // A lane that has been deleted is not a target either — a lane delete is physical, so the
-        // creation destination.
+        // memory simply names nothing.
         #expect(resolve(snapshot, lastActive: lane3)
             == NewCardTarget.Resolution(laneID: lane1, anchorCardID: nil))
     }
 
-    @Test("A tombstoned selection never anchors creation — it behaves as nothing selected")
+    @Test("A trash selection never anchors creation — it behaves as nothing selected")
-    func aTombstonedSelectionNeverAnchors() throws {
+    func aTrashSelectionNeverAnchors() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let snapshot = try BoardLoader.load(boardRoot: fixture.root).model
 
-        // Settled in 04 ▸ The map, on the ⌘N rule's own wording: "a **tombstoned** selection, which
+        // 04 ▸ The map, on the ⌘N rule's own wording: "with nothing selected — or a **trash**
-        // never anchors creation". The trash-side lane is a real lane on disk with a live sibling
+        // selection, which never anchors creation". A trashed card's board-side lane must not leak
-        // list — the rule must not let its identity leak in as a target.
+        // in as a target.
-        let trashed = ItemReferenceSet(ids: [lane3], liveness: .trashed)
+        let inTrash = ItemReferenceSet(ids: [card1], container: .trash)
-        #expect(resolve(snapshot, selection: trashed, lastActive: lane2)
+        #expect(resolve(snapshot, selection: inTrash, lastActive: lane2)
             == NewCardTarget.Resolution(laneID: lane2, anchorCardID: nil))
-        #expect(resolve(snapshot, selection: trashed)
+        #expect(resolve(snapshot, selection: inTrash)
             == NewCardTarget.Resolution(laneID: lane1, anchorCardID: nil))
     }
 
@@ -140,21 +139,22 @@ struct NewCardTargetTests {
         // target — New Card, Return-creation, and Paste with a card payload disable via menu
         // validation until a lane exists."
         #expect(resolve(empty) == nil)
-        #expect(resolve(empty, selection: ItemReferenceSet(ids: [card1], liveness: .live)) == nil)
+        #expect(resolve(empty, selection: ItemReferenceSet(ids: [card1], container: .board)) == nil)
         #expect(resolve(empty, lastActive: lane1) == nil)
     }
 
-    @Test("A board whose every lane is tombstoned is a zero-lane board")
+    @Test("A board whose every lane has been deleted is a zero-lane board")
-    func everyLaneTombstonedIsAlsoZeroLane() throws {
+    func everyLaneDeletedIsAlsoZeroLane() throws {
-        let fixture = try WriterFixture()
+        let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
+        for lane in [Ident.lane1, Ident.lane2, Ident.lane3] where fixture.exists(lane) {
-        try fixture.item(Ident.lane1, tombstoned(order: "1024", title: "Todo"))
+            try FileManager.default.removeItem(at: fixture.url(lane))
+        }
         let snapshot = try BoardLoader.load(boardRoot: fixture.root).model
 
-        // The lanes are still in the snapshot — the trash renders them — but none is on the board,
+        // "Every lane deleted" is the design's own second reading of the zero-lane case — and a lane
-        // and "every lane deleted" is the design's own second reading of the zero-lane case.
+        // delete is physical now, so it is literally the same board as the hand-made one above.
-        #expect(snapshot.lanes.count == 1)
+        #expect(snapshot.lanes.isEmpty)
         #expect(resolve(snapshot) == nil)
     }
 
@@ -167,15 +167,15 @@ struct NewCardTargetTests {
         // "A multi-selection anchors at its last member in flatten order (lane `order`, then card
         // `order`, the multi-drag order)": card3 lives in lane2, which sorts after lane1's pair, so
         // creation follows card3 — the last-active lane never enters into it.
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card1, card3], liveness: .live), lastActive: lane1)
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card1, card3], container: .board), lastActive: lane1)
             == NewCardTarget.Resolution(laneID: lane2, anchorCardID: card3))
 
         // Within one lane the flatten order is card order: card2 sorts after card1.
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card1, card2], liveness: .live), lastActive: lane2)
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [card1, card2], container: .board), lastActive: lane2)
             == NewCardTarget.Resolution(laneID: lane1, anchorCardID: card2))
 
         // A multi-LANE selection appends to the last selected lane's bottom.
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [lane1, lane2], liveness: .live))
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [lane1, lane2], container: .board))
             == NewCardTarget.Resolution(laneID: lane2, anchorCardID: nil))
     }
 
@@ -187,7 +187,7 @@ struct NewCardTargetTests {
 
         // A selection naming something the board does not render — the reload that drops it has not
         // landed yet — must not refuse the creation the user just asked for.
-        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [ItemID(rawValue: Ident.indexless)], liveness: .live))
+        #expect(resolve(snapshot, selection: ItemReferenceSet(ids: [ItemID(rawValue: Ident.indexless)], container: .board))
             == NewCardTarget.Resolution(laneID: lane1, anchorCardID: nil))
     }
 }

KanbanTests/PasteWriteTests.swift

@@ -61,9 +61,9 @@ struct PasteFromStagingTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let arrived = try #require(try pastedIDs(destinationLane, in: destination).last)
@@ -85,9 +85,9 @@ struct PasteFromStagingTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let arrived = try #require(try pastedIDs(destinationLane, in: destination).last)
@@ -107,9 +107,9 @@ struct PasteFromStagingTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(try pastedTitles(clipboardLane1, in: harness.fixture) == ["First", "Second"])
@@ -123,13 +123,13 @@ struct PasteFromStagingTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
         target.handleWatcherEvent(.treeChanged(.appMediated))
         await target.awaitQuiescence()
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let ids = try pastedIDs(destinationLane, in: destination)
@@ -142,7 +142,7 @@ struct PasteFromStagingTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.paste(into: harness.store)?.value
 
@@ -159,15 +159,15 @@ struct PasteFromStagingTests {
 @Suite("Paste ▸ lanes")
 struct PasteLaneTests {
 
-    @Test("A pasted lane copy takes fresh GUIDs throughout and strips tombstoned cards")
+    @Test("A pasted lane copy takes fresh GUIDs throughout and carries exactly its cards")
-    func laneCopyStripsTombstones() async throws {
+    func laneCopyRemintsThroughout() async throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
         let destination = try makeDestination()
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardLane1], liveness: .live)
+        harness.store.select([clipboardLane1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.paste(into: target)?.value
 
@@ -176,12 +176,11 @@ struct PasteLaneTests {
         let arrived = try #require(model.lanes.last)
         #expect(arrived.id.rawValue != Ident.lane1)
         #expect(arrived.title.value == "Todo")
-        // The tombstoned card is gone — "the copy transfers content, and trash isn't content".
+        // "A lane carries exactly its cards — the trash is board-level, so there is nothing
+        // lane-nested to strip or carry" (04 ▸ Drag and drop, resettled 2026-07-28).
         #expect(arrived.cards.count == 2)
-        #expect(arrived.cards.allSatisfy { !$0.isDeleted })
         #expect(arrived.cards.map(\.id.rawValue).allSatisfy { $0 != Ident.card1 && $0 != Ident.card2 })
-        // The tombstoned original is still recoverable where it always was.
+        #expect(try pasted(harness.fixture).trash.count == 1, "and the source's trash is untouched")
-        #expect(try lane(clipboardLane1, in: harness.fixture)?.cards.count == 3)
     }
 
     @Test("A lane paste with nothing selected lands at the board's right end")
@@ -192,7 +191,7 @@ struct PasteLaneTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardLane1], liveness: .live)
+        harness.store.select([clipboardLane1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.paste(into: target)?.value
 
@@ -208,30 +207,30 @@ struct PasteLaneTests {
         try empty.item("", Item.board)
         let target = try BoardStore(rootURL: empty.root)
 
-        harness.store.select([clipboardLane1], liveness: .live)
+        harness.store.select([clipboardLane1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(try pasted(empty).lanes.compactMap(\.title.value) == ["Todo"])
     }
 
-    @Test("A lane cut-move carries its tombstoned cards whole")
+    @Test("A lane cut-move carries its cards whole, identity and all")
-    func laneCutMoveCarriesTombstones() async throws {
+    func laneCutMoveCarriesItsCards() async throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
         let destination = try makeDestination()
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardLane1], liveness: .live)
+        harness.store.select([clipboardLane1], in: .board)
         harness.clipboard.cut(from: harness.store)
         await harness.clipboard.paste(into: target)?.value
 
         let model = try pasted(destination)
         let arrived = try #require(model.lanes.first { $0.id == clipboardLane1 })
-        // Identity travelled, and the tombstone landed in the destination's trash.
+        // Identity travelled, and every card came with it — nothing to strip.
-        #expect(arrived.cards.count == 3)
+        #expect(arrived.cards.count == 2)
-        #expect(arrived.cards.contains { $0.isDeleted })
+        #expect(model.trash.isEmpty, "the source board's trash is board-level and stays there")
         // The lane left the source board entirely.
         #expect(try pasted(harness.fixture).lanes.map(\.id) == [clipboardLane2])
     }
@@ -241,7 +240,7 @@ struct PasteLaneTests {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
 
-        harness.store.select([clipboardLane1], liveness: .live)
+        harness.store.select([clipboardLane1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.paste(into: harness.store)?.value
 
@@ -259,8 +258,8 @@ struct PasteLaneTests {
 @Suite("Paste ▸ from the trash")
 struct PasteFromTrashTests {
 
-    @Test("A card copied out of the trash arrives live")
+    @Test("A card copied out of the trash is an ordinary copy of an ordinary card")
-    func cardArrivesLive() async throws {
+    func cardCopiesOutOrdinarily() async throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
         let destination = try makeDestination()
@@ -268,46 +267,39 @@ struct PasteFromTrashTests {
         let target = try BoardStore(rootURL: destination.root)
 
         harness.store.transient.isTrashVisible = true
-        harness.store.select([clipboardCard3], liveness: .trashed)
+        harness.store.select([clipboardCard3], in: .trash)
         harness.clipboard.copy(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(try pastedTitles(destinationLane, in: destination) == ["Resident", "Trashed"])
-        // And the tombstoned original stays in the source trash — copy-out, never a move.
+        // The original stays in the source trash — a copy is a copy (04 ▸ The trash: "⌘C copies a
-        #expect(try lane(clipboardLane1, in: harness.fixture)?
+        // trash card; a live copy lands wherever pasted, like copying out of Finder's Trash").
-            .cards.first { $0.id == clipboardCard3 }?.isDeleted == true)
+        #expect(try pasted(harness.fixture).trash.map(\.id) == [clipboardCard3])
+        // And nothing had to be stripped on arrival: a trashed card carries no key at all.
+        let landed = try #require(try lane(destinationLane, in: destination)?.cards.last)
+        #expect(landed.deleted.isMissing)
     }
 
-    @Test("A lane entry copied out of the trash arrives live, its tombstoned interior cards stripped")
+    /// **Cut in the trash, paste into a lane, is the keyboard-native restore** (04-interactions.md
-    func laneEntryStripsBothWays() async throws {
+    /// ▸ The trash, resettled 2026-07-28) — "an ordinary folder move", which is exactly what the
-        let fixture = try WriterFixture()
+    /// armed cut already does.
-        defer { fixture.tearDown() }
+    @Test("Cut in the trash and paste into a lane is the keyboard restore — the folder moves")
-        try fixture.item("", Item.board)
+    func cutFromTheTrashIsTheKeyboardRestore() async throws {
-        // A tombstoned lane holding one plain card and one that carries its own tombstone.
+        let harness = try makeClipboardHarness()
-        try fixture.item(Ident.lane1, tombstonedItem(order: "1024", title: "Archive"))
+        defer { harness.tearDown() }
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "Kept"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)", tombstonedItem(order: "2048", title: "Gone"))
-        try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Doing"))
-
-        let harness = try ClipboardHarness(fixture: fixture)
-        defer { try? FileManager.default.removeItem(at: harness.staging) }
-        let destination = try makeDestination()
-        defer { destination.tearDown() }
-        let target = try BoardStore(rootURL: destination.root)
 
         harness.store.transient.isTrashVisible = true
-        harness.store.select([clipboardLane1], liveness: .trashed)
+        harness.store.select([clipboardCard3], in: .trash)
-        harness.clipboard.copy(from: harness.store)
+        harness.clipboard.cut(from: harness.store)
-        await harness.clipboard.paste(into: target)?.value
+        harness.store.select([clipboardLane2], in: .board)
+        await harness.clipboard.paste(into: harness.store)?.value
 
-        let model = try pasted(destination)
+        let model = try pasted(harness.fixture)
-        let arrived = try #require(model.lanes.last)
+        #expect(model.trash.isEmpty, "the folder left the trash")
-        #expect(arrived.isDeleted == false)
+        let lane = try #require(model.lanes.first { $0.id == clipboardLane2 })
-        #expect(arrived.title.value == "Archive")
+        #expect(lane.cards.map(\.id).contains(clipboardCard3), "identity travels — it is a move")
-        #expect(arrived.cards.count == 1)
+        #expect(harness.store.transient.pendingCut.isEmpty, "the cut was consumed")
-        #expect(arrived.cards.first?.title.value == "Kept")
-        #expect(arrived.cards.first?.isDeleted == false)
     }
 }
 
@@ -337,9 +329,9 @@ struct PasteSearchAndStalenessTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         // "First" would be hidden by this query — exactly the card that must not arrive invisible.
         target.searchQuery = "resident"
         await harness.clipboard.paste(into: target)?.value
@@ -356,7 +348,7 @@ struct PasteSearchAndStalenessTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardLane2], liveness: .live)
+        harness.store.select([clipboardLane2], in: .board)
         harness.clipboard.copy(from: harness.store)
         target.searchQuery = "resident"
         await harness.clipboard.paste(into: target)?.value
@@ -373,10 +365,10 @@ struct PasteSearchAndStalenessTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         harness.pasteboard.takeOver()
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         target.searchQuery = "resident"
 
         // `refresh()` at the front of the paste sees the moved changeCount, so there is no payload
@@ -395,9 +387,9 @@ struct PasteSearchAndStalenessTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         target.searchQuery = "resident"
 
         // The gesture passed validation; the takeover lands while the task is still waiting on the
@@ -427,9 +419,9 @@ struct PasteCutTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.cut(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         // Identity travelled.
@@ -450,13 +442,13 @@ struct PasteCutTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.cut(from: harness.store)
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
         target.handleWatcherEvent(.treeChanged(.appMediated))
         await target.awaitQuiescence()
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let ids = try pastedIDs(destinationLane, in: destination)
@@ -474,12 +466,12 @@ struct PasteCutTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.cut(from: harness.store)
         // The source board closes — its store goes, and with it the cut's arming.
         harness.store.transient.pendingCut = .empty
 
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         // A copy: a fresh identity at the destination, and the original still at home.
@@ -496,22 +488,21 @@ struct PasteCutTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1, clipboardCard2], liveness: .live)
+        harness.store.select([clipboardCard1, clipboardCard2], in: .board)
         harness.clipboard.cut(from: harness.store)
 
-        // One of the two is tombstoned before the paste: the reload ejects it from the pending cut.
+        // One of the two is deleted before the paste: the reload ejects it from the pending cut.
         harness.store.delete([clipboardCard1])
         harness.store.handleWatcherEvent(.treeChanged(.appMediated))
         await harness.store.awaitQuiescence()
         #expect(harness.store.transient.pendingCut.ids == [clipboardCard2])
 
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(try pastedIDs(destinationLane, in: destination) == [Ident.indexless, Ident.card2])
-        // The tombstoned one stayed behind, in the source board's trash.
+        // The deleted one stayed behind, in the source board's trash.
-        #expect(try lane(clipboardLane1, in: harness.fixture)?
+        #expect(try pasted(harness.fixture).trash.map(\.id).contains(clipboardCard1))
-            .cards.first { $0.id == clipboardCard1 }?.isDeleted == true)
     }
 
     @Test("A cut emptied down to nothing is simply void — a paste copies instead")
@@ -522,14 +513,14 @@ struct PasteCutTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.cut(from: harness.store)
         harness.store.delete([clipboardCard1])
         harness.store.handleWatcherEvent(.treeChanged(.appMediated))
         await harness.store.awaitQuiescence()
         #expect(harness.store.transient.pendingCut.isEmpty)
 
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         // The staged snapshot is still there, so the paste is a copy — content intact.
@@ -551,7 +542,7 @@ struct PasteFallbackTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         // The snapshot goes — a swept tree, a full disk, an unreadable container.
@@ -560,7 +551,7 @@ struct PasteFallbackTests {
             at: harness.staging.appendingPathComponent(copyID, isDirectory: true)
         )
 
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         let arrived = try #require(try pastedIDs(destinationLane, in: destination).last)
@@ -585,7 +576,7 @@ struct PasteFallbackTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardCard1], liveness: .live)
+        harness.store.select([clipboardCard1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         let copyID = try #require(harness.clipboard.payload?.copyID)
@@ -593,7 +584,7 @@ struct PasteFallbackTests {
             at: harness.staging.appendingPathComponent(copyID, isDirectory: true)
         )
 
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(target.banners.losses.map(\.message) == ["Pasted 'First' without its 2 attachments"])
@@ -608,7 +599,7 @@ struct PasteFallbackTests {
         let target = try BoardStore(rootURL: destination.root)
 
         // `card2` has no attachments, so a fallback loses nothing at all.
-        harness.store.select([clipboardCard2], liveness: .live)
+        harness.store.select([clipboardCard2], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         let copyID = try #require(harness.clipboard.payload?.copyID)
@@ -616,7 +607,7 @@ struct PasteFallbackTests {
             at: harness.staging.appendingPathComponent(copyID, isDirectory: true)
         )
 
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(try pastedTitles(destinationLane, in: destination) == ["Resident", "Second"])
@@ -631,7 +622,7 @@ struct PasteFallbackTests {
         defer { destination.tearDown() }
         let target = try BoardStore(rootURL: destination.root)
 
-        harness.store.select([clipboardLane1], liveness: .live)
+        harness.store.select([clipboardLane1], in: .board)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         let copyID = try #require(harness.clipboard.payload?.copyID)
@@ -643,14 +634,14 @@ struct PasteFallbackTests {
 
         let arrived = try #require(try pasted(destination).lanes.last)
         #expect(arrived.title.value == "Todo")
-        // The two live cards, and not the tombstoned third.
+        // Both of the lane's cards.
         #expect(arrived.cards.count == 2)
         #expect(Set(arrived.cards.compactMap(\.title.value)) == ["First", "Second"])
         #expect(target.banners.losses.map(\.message) == ["Pasted 'Todo' without its 2 attachments"])
     }
 
-    @Test("A trash-sourced fallback still strips `deleted:` at materialization")
+    @Test("A trash-sourced fallback materializes an ordinary card — there is no key to strip")
-    func trashedFallbackStripsDeleted() async throws {
+    func trashedFallbackIsOrdinary() async throws {
         let harness = try makeClipboardHarness()
         defer { harness.tearDown() }
         let destination = try makeDestination()
@@ -658,7 +649,7 @@ struct PasteFallbackTests {
         let target = try BoardStore(rootURL: destination.root)
 
         harness.store.transient.isTrashVisible = true
-        harness.store.select([clipboardCard3], liveness: .trashed)
+        harness.store.select([clipboardCard3], in: .trash)
         harness.clipboard.copy(from: harness.store)
         await harness.clipboard.stagingSettled()
         let copyID = try #require(harness.clipboard.payload?.copyID)
@@ -666,7 +657,7 @@ struct PasteFallbackTests {
             at: harness.staging.appendingPathComponent(copyID, isDirectory: true)
         )
 
-        target.select([destinationLane], liveness: .live)
+        target.select([destinationLane], in: .board)
         await harness.clipboard.paste(into: target)?.value
 
         #expect(try pastedTitles(destinationLane, in: destination) == ["Resident", "Trashed"])

KanbanTests/RawSourceTests.swift

@@ -423,18 +423,18 @@ struct RawSourceStoreTests {
     func aTombstonedCardIsRefused() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        try BoardWriter.deleteItem(at: fixture.url(cardPath))
+        try fixture.move(cardPath, toTrash: Ident.card1)
         let store = try BoardStore(rootURL: fixture.root)
-        let before = try fixture.indexData(cardPath)
+        let before = try fixture.indexData(".trash/\(Ident.card1)")
         let card = ItemID(rawValue: Ident.card1)
 
-        // 05 ▸ Deletion & lifecycle: "An open raw-source buffer discards instead: its Apply writes
+        // 05 ▸ Deletion & lifecycle: "An open raw-source buffer discards instead: its Apply would
-        // the *whole* pre-tombstone `index.md` and would silently undelete the card — a foreign
+        // write a whole stale `index.md` over the trashed card — a delete is never fought by a stale
-        // delete is never reverted by a stale buffer." The Edit buffer's flush is the opposite rule,
+        // buffer." The Edit buffer's flush is the opposite rule, deliberately, which is why the two
-        // deliberately, which is why the two walks differ (`liveItem` vs `cardBodyTarget`).
+        // walks differ (`boardItem` vs `cardBodyTarget`).
         #expect(store.readCardSource(inCard: card) == .vanished)
         #expect(store.applyCardSource(inCard: card, text: handEditedSource) == .vanished)
-        #expect(try fixture.indexData(cardPath) == before)
+        #expect(try fixture.indexData(".trash/\(Ident.card1)") == before)
     }
 
     @Test("A card that is not in the board at all is vanished too")

KanbanTests/SearchFilterTests.swift

@@ -105,18 +105,8 @@ private func makeTrashBoard() throws -> WriterFixture {
     let fixture = try WriterFixture()
     try fixture.item("", Item.board)
     try fixture.item(Ident.lane1, item(order: "1024", title: "Todo", body: "Inbox lane."))
-    try fixture.item(
+    try fixture.item(".trash/\(Ident.card1)", item(order: "1024", title: "Fix login", body: "Auth."))
-        "\(Ident.lane1)/\(Ident.card1)",
+    try fixture.item(".trash/\(Ident.card2)", item(order: "2048", title: "Polish", body: "Wording."))
-        tombstoned(order: "1024", title: "Fix login", body: "Auth.", deleted: "2026-03-05T10:00:00Z")
-    )
-    try fixture.item(
-        "\(Ident.lane1)/\(Ident.card2)",
-        tombstoned(order: "2048", title: "Polish", body: "Wording.", deleted: "2026-03-05T06:00:00Z")
-    )
-    try fixture.item(
-        More.laneX,
-        tombstoned(order: "2048", title: "Old login lane", body: "Retired.", deleted: "2026-03-05T08:00:00Z")
-    )
     return fixture
 }
 
@@ -238,17 +228,17 @@ struct SearchFilterPredicateTests {
         #expect(!SearchFilter(query: "csv").matches(unrelated))
     }
 
-    @Test("A lane matches by its own title and body — the trash's rows, not the board's lanes")
+    @Test("There is no lane predicate: the filter is a card predicate, end to end")
-    func lanesMatchByTheirOwnText() throws {
+    func lanesAreNeverFiltered() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let model = try load(fixture)
-        let todo = try #require(model.lanes.first { $0.id == lane1 })
 
-        #expect(SearchFilter(query: "todo").matches(todo))
+        // 04 § Search filters *cards*. Under the tombstone model the trash held lane *entries* that
-        #expect(SearchFilter(query: "inbox").matches(todo))
+        // had to be matched like rows, which is why `matches(_: Lane)` existed; lanes are never
-        // A lane is not matched through its cards: `card1` says "login", the lane does not.
+        // trashed now, so the overload went with them and every lane is always visible.
-        #expect(!SearchFilter(query: "login").matches(todo))
+        let visible = SearchFilter(query: "nothing-matches-this").visibleIDs(in: model, container: .board)
+        #expect(visible == Set(model.lanes.map(\.id)))
     }
 
     @Test("The visible universe keeps every live lane and only the matching cards")
@@ -257,7 +247,7 @@ struct SearchFilterPredicateTests {
         defer { fixture.tearDown() }
         let model = try load(fixture)
 
-        let visible = SearchFilter(query: "login").visibleIDs(in: model, on: .live)
+        let visible = SearchFilter(query: "login").visibleIDs(in: model, container: .board)
         // Lanes are never hidden by a card query — a lane the filter empties is still a lane on the
         // board, so a lane selection survives a query that empties its body.
         #expect(visible.isSuperset(of: [lane1, lane2, lane3]))
@@ -277,12 +267,9 @@ struct SearchFilterOrderTests {
         defer { fixture.tearDown() }
         let model = try load(fixture)
 
-        #expect(SelectionGrammar.liveCards(in: model) == [card1, card2, card3, card4, card5])
+        #expect(SelectionGrammar.boardCards(in: model) == [card1, card2, card3, card4, card5])
-        #expect(SelectionGrammar.liveCards(in: model, filter: SearchFilter(query: "login")) == [card1, card3])
+        #expect(SelectionGrammar.boardCards(in: model, filter: SearchFilter(query: "login")) == [card1, card3])
-        #expect(SelectionGrammar.order(
+        #expect(SelectionGrammar.order(of: .card, in: .board, snapshot: model,
-            of: .card,
-            on: .live,
-            in: model,
             filter: SearchFilter(query: "login")
         ) == [card1, card3])
     }
@@ -295,10 +282,7 @@ struct SearchFilterOrderTests {
 
         // `lane3`'s only card misses the query, and the lane is still in the order: the width
         // division is layout, and a `0` badge is the honest report.
-        #expect(SelectionGrammar.order(
+        #expect(SelectionGrammar.order(of: .lane, in: .board, snapshot: model,
-            of: .lane,
-            on: .live,
-            in: model,
             filter: SearchFilter(query: "login")
         ) == [lane1, lane2, lane3])
     }
@@ -310,16 +294,11 @@ struct SearchFilterOrderTests {
         let model = try load(fixture)
 
         // Unfiltered, card1 → card3 sweeps card2 up with it.
-        #expect(SelectionGrammar.range(from: card1, to: card3, kind: .card, on: .live, in: model)
+        #expect(SelectionGrammar.range(from: card1, to: card3, kind: .card, in: .board, snapshot: model)
             == [card1, card2, card3])
 
         // Filtered, the span between the same two endpoints is the two that are on screen.
-        #expect(SelectionGrammar.range(
+        #expect(SelectionGrammar.range(from: card1, to: card3, kind: .card, in: .board, snapshot: model,
-            from: card1,
-            to: card3,
-            kind: .card,
-            on: .live,
-            in: model,
             filter: SearchFilter(query: "login")
         ) == [card1, card3])
     }
@@ -330,34 +309,31 @@ struct SearchFilterOrderTests {
         defer { fixture.tearDown() }
         let model = try load(fixture)
 
-        #expect(SelectionGrammar.range(
+        #expect(SelectionGrammar.range(from: card1, to: card2, kind: .card, in: .board, snapshot: model,
-            from: card1,
-            to: card2,
-            kind: .card,
-            on: .live,
-            in: model,
             filter: SearchFilter(query: "login")
         ) == nil)
     }
 
-    @Test("Trash entries filter like any lane — card rows and lane rows alike, by their own text")
+    @Test("Trash cards participate in the filter exactly like any other card")
-    func trashEntriesNarrow() throws {
+    func trashCardsNarrow() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let model = try load(fixture)
 
-        #expect(SelectionGrammar.trashEntries(of: .card, in: model) == [card1, card2])
+        #expect(SelectionGrammar.trashCards(in: model) == [card1, card2])
-        #expect(SelectionGrammar.trashEntries(of: .lane, in: model) == [laneX])
+        #expect(SelectionGrammar.trashCards(in: model, filter: SearchFilter(query: "login")) == [card1])
+        // And there is no lane list in the trash at all — "Cards only. Lanes are never trashed".
+        #expect(SelectionGrammar.order(of: .lane, in: .trash, snapshot: model).isEmpty)
+    }
 
-        let filter = SearchFilter(query: "login")
+    @Test("The trash's visible universe is its matching cards")
-        #expect(SelectionGrammar.trashEntries(of: .card, in: model, filter: filter) == [card1])
+    func trashUniverseNarrows() throws {
-        // The lane row matches on its *own* title, not on the card buried inside it.
+        let fixture = try makeTrashBoard()
-        #expect(SelectionGrammar.trashEntries(of: .lane, in: model, filter: filter) == [laneX])
+        defer { fixture.tearDown() }
-        #expect(SelectionGrammar.trashEntries(
+        let model = try load(fixture)
-            of: .lane,
+
-            in: model,
+        #expect(SearchFilter(query: "login").visibleIDs(in: model, container: .trash) == [card1])
-            filter: SearchFilter(query: "polish")
+        #expect(SearchFilter.inactive.visibleIDs(in: model, container: .trash) == [card1, card2])
-        ).isEmpty)
     }
 
     @Test("The delete successor is drawn from what the lane is showing")
@@ -367,12 +343,12 @@ struct SearchFilterOrderTests {
         let model = try load(fixture)
 
         // Unfiltered, deleting the untitled card lands on its lane's next card.
-        #expect(SelectionGrammar.successor(afterDeleting: [card3], in: model) == card4)
+        #expect(SelectionGrammar.successor(afterDeleting: [card3], snapshot: model) == card4)
         // Under `login`, card4 is hidden — and there is nothing else visible in that lane, so the
         // honest answer is nothing rather than a card the query animated out.
         #expect(SelectionGrammar.successor(
             afterDeleting: [card3],
-            in: model,
+            snapshot: model,
             filter: SearchFilter(query: "login")
         ) == nil)
     }
@@ -405,11 +381,11 @@ struct SearchFilterStoreTests {
         let store = try BoardStore(rootURL: fixture.root)
 
         store.transient.isTrashVisible = true
-        store.select([card2], liveness: .trashed)
+        store.select([card2], in: .trash)
         store.selectAll()
         #expect(store.selection.ids == [card1, card2])
 
-        store.select([card1], liveness: .trashed)
+        store.select([card1], in: .trash)
         store.searchQuery = "login"
         store.selectAll()
         #expect(store.selection.ids == [card1])
@@ -421,7 +397,7 @@ struct SearchFilterStoreTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card1, card2], liveness: .live, anchor: card1, head: card2)
+        store.select([card1, card2], in: .board, anchor: card1, head: card2)
         store.searchQuery = "login"
 
         #expect(store.selection.ids == [card1])
@@ -437,7 +413,7 @@ struct SearchFilterStoreTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([lane3], liveness: .live)
+        store.select([lane3], in: .board)
         store.searchQuery = "login"
         #expect(store.selection.ids == [lane3])
     }
@@ -449,12 +425,12 @@ struct SearchFilterStoreTests {
         let store = try BoardStore(rootURL: fixture.root)
 
         store.searchQuery = "login"
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
         store.clearSearch()
 
         #expect(store.searchQuery.isEmpty)
         #expect(store.selection.ids == [card1])
-        #expect(SelectionGrammar.liveCards(in: store.snapshot, filter: store.searchFilter).count == 5)
+        #expect(SelectionGrammar.boardCards(in: store.snapshot, filter: store.searchFilter).count == 5)
     }
 
     @Test("A reload landing under an active query re-applies the filter to the selection")
@@ -464,7 +440,7 @@ struct SearchFilterStoreTests {
         let store = try BoardStore(rootURL: fixture.root)
 
         store.searchQuery = "login"
-        store.select([card1, card3], liveness: .live, anchor: card1, head: card3)
+        store.select([card1, card3], in: .board, anchor: card1, head: card3)
 
         // An agent edits the title out of the match. The card is still there — this is not a vanish,
         // so only the *filter's* universe can eject it.
@@ -502,7 +478,7 @@ struct SearchFilterStoreTests {
         let store = try BoardStore(rootURL: fixture.root)
 
         store.searchQuery = "login"
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
 
         store.transient.beginRename(of: card1, currentTitle: "Fix login")
         #expect(store.searchQuery == "login")
@@ -526,7 +502,7 @@ struct SearchFilterStoreTests {
         let store = try BoardStore(rootURL: fixture.root)
 
         store.searchQuery = "login"
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
 
         store.transient.beginRename(of: card1, currentTitle: "Fix login")
         store.transient.updateRenameDraft("Fix login again")
@@ -544,7 +520,7 @@ struct SearchFilterStoreTests {
 
         // `Todo` shows both its cards under this query, so the successor is the visible neighbour.
         store.searchQuery = "the"
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
         store.delete([card1])
         #expect(store.selection.ids == [card2])
     }
@@ -572,7 +548,7 @@ struct SearchFilterExemptionTests {
         let filter = SearchFilter(query: "login")
 
         // Every live lane is in the visible universe, `Done` — which holds only a miss — included.
-        let visible = filter.visibleIDs(in: model, on: .live)
+        let visible = filter.visibleIDs(in: model, container: .board)
         #expect(visible.isSuperset(of: [lane1, lane2, lane3]))
         #expect(!visible.contains(card5))
 
@@ -623,7 +599,7 @@ struct SearchFilterExemptionTests {
         let store = try BoardStore(rootURL: fixture.root)
 
         store.searchQuery = "login"
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
         store.transient.beginRename(of: card1, currentTitle: "Fix login")
         store.transient.updateRenameDraft("Fix login thoroughly")
 
@@ -644,7 +620,7 @@ struct SearchFilterExemptionTests {
         #expect(try card(card1, in: store.snapshot).title.value == "Fix login thoroughly")
     }
 
-    @Test("A vanish still discards the editor — the carve-out is the filter's, not liveness's")
+    @Test("A vanish still discards the editor — the carve-out is the filter's, not the container's")
     func aVanishStillDiscardsTheEditor() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
@@ -652,10 +628,7 @@ struct SearchFilterExemptionTests {
 
         store.searchQuery = "login"
         store.transient.beginRename(of: card1, currentTitle: "Fix login")
-        try fixture.item(
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
-            "\(Ident.lane1)/\(Ident.card1)",
-            tombstoned(order: "1024", title: "Fix login", body: "The auth flow breaks on retry.")
-        )
         await reload(store)
 
         #expect(store.transient.renameEditor == nil)

KanbanTests/SelectionGrammarTests.swift

@@ -8,40 +8,27 @@ import Testing
 ///
 /// The grammar is written as a pure function precisely so it can be tested like one: a click, a
 /// selection, an anchor and a snapshot in, a selection and an anchor out — no window, no gesture, no
-/// modifier flags. The boards underneath are **real loads off real temp trees**, because every rule
+/// modifier flags. The boards underneath are **real loads off real temp trees**, because the rules
-/// here reads `isDeleted`, card ordering, or `TrashModel`'s sort, and a hand-built `BoardModel`
+/// read card ordering and the trash container, and a hand-built `BoardModel` would let both drift
-/// would let all three drift from what the loader actually produces.
+/// from what the loader actually produces.
+///
+/// **Two homogeneity axes, not three** (resettled 2026-07-28): cards XOR lanes, and board XOR trash.
+/// The third — card entries XOR lane entries *inside* the trash — retired with the lane entries it
+/// separated, because lanes are never trashed.
 ///
 /// `WriterFixture`, `Ident` and `Item` live in `WriterTestSupport.swift`.
 
 // MARK: - Fixtures
 
-/// More literal identities than `Ident` offers: a three-lane range needs five cards, and the trash's
+/// More literal identities than `Ident` offers: a three-lane range needs five cards.
-/// interleaving needs entries whose folder names are distinguishable in the sort's tie-break.
 private enum More {
     static let card5 = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa"
-    static let laneX = "bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb"
+    static let card6 = "bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb"
-    static let laneY = "cccccccc-cccc-4ccc-8ccc-cccccccccccc"
 }
 
-private func tombstoned(order: String, title: String, deleted: String = "2026-03-03T09:00:00Z") -> String {
+/// Three lanes and five cards — enough that a flatten-order range crosses two lane boundaries.
-    """
-    ---
-    schema: 1
-    title: \(title)
-    order: \(order)
-    deleted: \(deleted)
-    ---
-    \(title) body.
-
-    """
-}
-
-/// Three live lanes, five live cards and one tombstoned card — enough that a flatten-order range
-/// crosses two lane boundaries and has something to *skip* on the way.
 ///
-/// Flatten order of the live cards is `[card1, card2, card3, card5]`; `card4` carries its own
+/// Flatten order is `[card1, card2, card3, card4, card5]`.
-/// `deleted:` and is in none of it.
 @MainActor
 private func makeLiveBoard() throws -> WriterFixture {
     let fixture = try WriterFixture()
@@ -51,27 +38,23 @@ private func makeLiveBoard() throws -> WriterFixture {
     try fixture.item("\(Ident.lane1)/\(Ident.card2)", Item.rich(order: "2048", title: "Second"))
     try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Doing"))
     try fixture.item("\(Ident.lane2)/\(Ident.card3)", Item.rich(order: "1024", title: "Third"))
-    try fixture.item("\(Ident.lane2)/\(Ident.card4)", tombstoned(order: "2048", title: "Fourth"))
+    try fixture.item("\(Ident.lane2)/\(Ident.card4)", Item.rich(order: "2048", title: "Fourth"))
     try fixture.item(Ident.lane3, Item.rich(order: "3072", title: "Done"))
     try fixture.item("\(Ident.lane3)/\(More.card5)", Item.rich(order: "1024", title: "Fifth"))
     return fixture
 }
 
-/// A trash whose two row kinds **interleave**, which is the only shape that can prove a range skips.
+/// A board with one lane and three cards in its `.trash/` — the container the trash-side grammar
-///
+/// walks, in `order` display order (`[card1, card2, card3]`, newest first by ordinary ranks).
-/// `TrashModel`'s sort is newest `deleted` first, so the entry order is
-/// `[card1, laneX, card2, laneY, card3]` — a card range from `card1` to `card3` has two lane rows
-/// sitting inside its span, and a lane range from `laneX` to `laneY` has a card row inside its own.
 @MainActor
 private func makeTrashBoard() throws -> WriterFixture {
     let fixture = try WriterFixture()
     try fixture.item("", Item.board)
     try fixture.item(Ident.lane1, Item.rich(order: "1024", title: "Todo"))
-    try fixture.item("\(Ident.lane1)/\(Ident.card1)", tombstoned(order: "1024", title: "First", deleted: "2026-03-05T10:00:00Z"))
+    try fixture.item("\(Ident.lane1)/\(More.card6)", Item.rich(order: "1024", title: "Live"))
-    try fixture.item("\(Ident.lane1)/\(Ident.card2)", tombstoned(order: "2048", title: "Second", deleted: "2026-03-05T08:00:00Z"))
+    try fixture.item(".trash/\(Ident.card1)", Item.rich(order: "256", title: "First"))
-    try fixture.item("\(Ident.lane1)/\(Ident.card3)", tombstoned(order: "3072", title: "Third", deleted: "2026-03-05T06:00:00Z"))
+    try fixture.item(".trash/\(Ident.card2)", Item.rich(order: "512", title: "Second"))
-    try fixture.item(More.laneX, tombstoned(order: "2048", title: "Archive", deleted: "2026-03-05T09:00:00Z"))
+    try fixture.item(".trash/\(Ident.card3)", Item.rich(order: "1024", title: "Third"))
-    try fixture.item(More.laneY, tombstoned(order: "3072", title: "Old", deleted: "2026-03-05T07:00:00Z"))
     return fixture
 }
 
@@ -83,19 +66,18 @@ private let card2 = ItemID(rawValue: Ident.card2)
 private let card3 = ItemID(rawValue: Ident.card3)
 private let card4 = ItemID(rawValue: Ident.card4)
 private let card5 = ItemID(rawValue: More.card5)
-private let laneX = ItemID(rawValue: More.laneX)
+private let card6 = ItemID(rawValue: More.card6)
-private let laneY = ItemID(rawValue: More.laneY)
 
 private func load(_ fixture: WriterFixture) throws -> BoardModel {
     try BoardLoader.load(boardRoot: fixture.root).model
 }
 
-private func target(_ id: ItemID, _ kind: SelectionKind, _ side: Liveness = .live) -> SelectionTarget {
+private func target(_ id: ItemID, _ kind: SelectionKind, _ container: ItemContainer = .board) -> SelectionTarget {
-    SelectionTarget(id: id, kind: kind, side: side)
+    SelectionTarget(id: id, kind: kind, container: container)
 }
 
-private func set(_ ids: Set<ItemID>, _ side: Liveness = .live) -> ItemReferenceSet {
+private func set(_ ids: Set<ItemID>, _ container: ItemContainer = .board) -> ItemReferenceSet {
-    ItemReferenceSet(ids: ids, liveness: side)
+    ItemReferenceSet(ids: ids, container: container)
 }
 
 /// One click, with the grammar's own defaults filled in.
@@ -123,7 +105,7 @@ private func click(
 @Suite("SelectionGrammar ▸ order")
 struct SelectionOrderTests {
 
-    @Test("Live cards flatten lane order first, then card order — tombstones excluded")
+    @Test("Board cards flatten lane order first, then card order")
     func flattenOrder() throws {
         let fixture = try makeLiveBoard()
         defer { fixture.tearDown() }
@@ -131,22 +113,21 @@ struct SelectionOrderTests {
 
         // "Lane `order` first, then card `order` (a cross-lane selection flattens left-to-right,
         // top-to-bottom)" — the multi-drag order (04-interactions.md ▸ Drag and drop).
-        #expect(SelectionGrammar.liveCards(in: snapshot) == [card1, card2, card3, card5])
+        #expect(SelectionGrammar.boardCards(in: snapshot) == [card1, card2, card3, card4, card5])
-        #expect(SelectionGrammar.liveLanes(in: snapshot) == [lane1, lane2, lane3])
+        #expect(SelectionGrammar.lanes(in: snapshot) == [lane1, lane2, lane3])
     }
 
-    @Test("Trash order lists are one sort, filtered to one kind")
+    @Test("The trash's list is its cards, in `order`; its lane list is empty by construction")
-    func trashOrderPerKind() throws {
+    func trashOrder() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        // The single ordering the quasi-lane shows, newest first.
+        #expect(SelectionGrammar.trashCards(in: snapshot) == [card1, card2, card3])
-        #expect(TrashModel.entries(of: snapshot).map(\.id) == [card1, laneX, card2, laneY, card3])
+        #expect(SelectionGrammar.order(of: .card, in: .trash, snapshot: snapshot) == [card1, card2, card3])
-        // Each kind's list is that ordering with the other kind's rows dropped — which is exactly
+        // "Cards only. Lanes are never trashed" — so there is no list to walk rather than a rule
-        // what makes a ⇧-range step over them (04-interactions.md ▸ The trash).
+        // saying not to (03-board-ui.md § Trash).
-        #expect(SelectionGrammar.trashEntries(of: .card, in: snapshot) == [card1, card2, card3])
+        #expect(SelectionGrammar.order(of: .lane, in: .trash, snapshot: snapshot).isEmpty)
-        #expect(SelectionGrammar.trashEntries(of: .lane, in: snapshot) == [laneX, laneY])
     }
 
     @Test("A selection's kind is derived from the snapshot, and a ghost selection has none")
@@ -158,10 +139,10 @@ struct SelectionOrderTests {
         #expect(SelectionGrammar.kind(of: set([card1, card3]), in: snapshot) == .card)
         #expect(SelectionGrammar.kind(of: set([lane2]), in: snapshot) == .lane)
         #expect(SelectionGrammar.kind(of: .empty, in: snapshot) == nil)
-        // A tombstoned card is on neither side's live list, and the live side is what this set says.
+        // A set claiming a container that does not hold its members answers nothing.
-        #expect(SelectionGrammar.kind(of: set([card4]), in: snapshot) == nil)
+        #expect(SelectionGrammar.kind(of: set([card1], .trash), in: snapshot) == nil)
         // Members that name nothing are ignored; one that names something still answers.
-        #expect(SelectionGrammar.kind(of: set([card4, card1]), in: snapshot) == .card)
+        #expect(SelectionGrammar.kind(of: set([ItemID(rawValue: Ident.indexless), card1]), in: snapshot) == .card)
     }
 }
 
@@ -205,9 +186,9 @@ struct PlainClickTests {
         #expect(card.selection == set([card1]))
         #expect(card.anchor == card1)
 
-        // Nor does the toggle reach across the boundary: a live click on a trashed sole selection
+        // Nor does the toggle reach across the boundary: a board click on a trash-side sole
-        // of the same id is a replace.
+        // selection of the same id is a replace.
-        let crossed = click(target(lane1, .lane), .plain, selection: set([lane1], .trashed), anchor: lane1, in: snapshot, togglesOnRepeat: true)
+        let crossed = click(target(lane1, .lane), .plain, selection: set([lane1], .trash), anchor: lane1, in: snapshot, togglesOnRepeat: true)
         #expect(crossed.selection == set([lane1]))
     }
 }
@@ -260,24 +241,19 @@ struct CommandClickTests {
         #expect(ontoCard.anchor == card1)
     }
 
-    @Test("⌘-click across the liveness boundary replaces too")
+    @Test("⌘-click across the container boundary replaces too")
-    func acrossSideReplaces() throws {
+    func acrossContainerReplaces() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        // "Selection is homogeneous by liveness … a selection never mixes live and tombstoned"
+        // "A selection never mixes trash cards with board cards — a single container rule replacing
-        // (04 ▸ The trash). The live lane1 is the only live thing on this board.
+        // the old liveness law" (04 ▸ The trash, resettled 2026-07-28).
-        let intoTrash = click(target(card1, .card, .trashed), .command, selection: set([lane1]), anchor: lane1, in: snapshot)
+        let intoTrash = click(target(card1, .card, .trash), .command, selection: set([card6]), anchor: card6, in: snapshot)
-        #expect(intoTrash.selection == set([card1], .trashed))
+        #expect(intoTrash.selection == set([card1], .trash))
 
-        let backOut = click(target(lane1, .lane), .command, selection: set([card1, card2], .trashed), anchor: card2, in: snapshot)
+        let backOut = click(target(card6, .card), .command, selection: set([card1, card2], .trash), anchor: card2, in: snapshot)
-        #expect(backOut.selection == set([lane1]))
+        #expect(backOut.selection == set([card6]))
-
-        // And within the trash, the second axis: card entries XOR lane entries.
-        let ontoLaneEntry = click(target(laneX, .lane, .trashed), .command, selection: set([card1, card2], .trashed), anchor: card2, in: snapshot)
-        #expect(ontoLaneEntry.selection == set([laneX], .trashed))
-        #expect(ontoLaneEntry.anchor == laneX)
     }
 
     @Test("⌘-click with nothing — or nothing real — selected replaces")
@@ -292,7 +268,8 @@ struct CommandClickTests {
 
         // A selection whose members all name nothing the board renders counts as empty: a ⌘-click
         // after a foreign delete starts a fresh set rather than extending a ghost.
-        let fromGhost = click(target(card1, .card), .command, selection: set([card4]), anchor: card4, in: snapshot)
+        let ghost = ItemID(rawValue: Ident.indexless)
+        let fromGhost = click(target(card1, .card), .command, selection: set([ghost]), anchor: ghost, in: snapshot)
         #expect(fromGhost.selection == set([card1]))
     }
 }
@@ -303,18 +280,16 @@ struct CommandClickTests {
 @Suite("SelectionGrammar ▸ ⇧-click")
 struct ShiftClickTests {
 
-    @Test("A ⇧-range spans the flatten order across lanes, skipping tombstones, and leaves the anchor put")
+    @Test("A ⇧-range spans the flatten order across lanes and leaves the anchor put")
     func rangeAcrossLanes() throws {
         let fixture = try makeLiveBoard()
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
         let outcome = click(target(card5, .card), .shift, selection: set([card1]), anchor: card1, in: snapshot)
-        #expect(outcome.selection == set([card1, card2, card3, card5]))
+        #expect(outcome.selection == set([card1, card2, card3, card4, card5]))
         // Finder-list style: the anchor is unchanged, so successive ⇧-clicks sweep from one origin.
         #expect(outcome.anchor == card1)
-        // card4 is tombstoned and in no order list, so no range can pick it up.
-        #expect(!outcome.selection.ids.contains(card4))
     }
 
     @Test("Direction does not matter — the range is the span between anchor and target")
@@ -324,7 +299,7 @@ struct ShiftClickTests {
         let snapshot = try load(fixture)
 
         let backwards = click(target(card1, .card), .shift, selection: set([card5]), anchor: card5, in: snapshot)
-        #expect(backwards.selection == set([card1, card2, card3, card5]))
+        #expect(backwards.selection == set([card1, card2, card3, card4, card5]))
         #expect(backwards.anchor == card5)
     }
 
@@ -350,8 +325,9 @@ struct ShiftClickTests {
         #expect(noAnchor.selection == set([card3]))
         #expect(noAnchor.anchor == card3)
 
-        // An anchor that names nothing the board renders (card4 is tombstoned).
+        // An anchor that names nothing the board renders.
-        let vanished = click(target(card3, .card), .shift, selection: set([card1]), anchor: card4, in: snapshot)
+        let ghost = ItemID(rawValue: Ident.indexless)
+        let vanished = click(target(card3, .card), .shift, selection: set([card1]), anchor: ghost, in: snapshot)
         #expect(vanished.selection == set([card3]))
         #expect(vanished.anchor == card3)
 
@@ -361,32 +337,35 @@ struct ShiftClickTests {
         #expect(acrossKind.selection == set([card3]))
         #expect(acrossKind.anchor == card3)
 
-        // Same for a side crossing: the live card list holds no trash row.
+        // Same for a container crossing: the board's card list holds no trash card.
-        let acrossSide = click(target(card3, .card, .trashed), .shift, selection: set([card1]), anchor: card1, in: snapshot)
+        let acrossContainer = click(target(card3, .card, .trash), .shift, selection: set([card1]), anchor: card1, in: snapshot)
-        #expect(acrossSide.selection == set([card3], .trashed))
+        #expect(acrossContainer.selection == set([card3], .trash))
     }
 
-    @Test("A trash card range steps over the lane entries inside its span")
+    @Test("A trash range walks the column's own order")
-    func trashCardRangeSkipsLaneEntries() throws {
+    func trashRangeWalksTheColumn() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        // Sorted order is [card1, laneX, card2, laneY, card3]; a card range collects card rows only.
+        // The column's order is `[card1, card2, card3]`; a range between the ends takes all three,
-        let outcome = click(target(card3, .card, .trashed), .shift, selection: set([card1], .trashed), anchor: card1, in: snapshot)
+        // with no kind to step over — lanes are never trashed.
-        #expect(outcome.selection == set([card1, card2, card3], .trashed))
+        let outcome = click(target(card3, .card, .trash), .shift, selection: set([card1], .trash), anchor: card1, in: snapshot)
+        #expect(outcome.selection == set([card1, card2, card3], .trash))
         #expect(outcome.anchor == card1)
     }
 
-    @Test("A trash lane range steps over the card entries inside its span")
+    @Test("A range never crosses the container boundary")
-    func trashLaneRangeSkipsCardEntries() throws {
+    func trashRangeStopsAtTheBoundary() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let snapshot = try load(fixture)
 
-        let outcome = click(target(laneY, .lane, .trashed), .shift, selection: set([laneX], .trashed), anchor: laneX, in: snapshot)
+        // `card6` is on the board and `card1` is in the trash: no single order list holds both, so
-        #expect(outcome.selection == set([laneX, laneY], .trashed))
+        // the anchor is not findable and the ⇧-click degrades to a plain one.
-        #expect(outcome.anchor == laneX)
+        let outcome = click(target(card1, .card, .trash), .shift, selection: set([card6]), anchor: card6, in: snapshot)
+        #expect(outcome.selection == set([card1], .trash))
+        #expect(outcome.anchor == card1)
     }
 }
 
@@ -395,53 +374,46 @@ struct ShiftClickTests {
 @Suite("MarqueeMath")
 struct MarqueeMathTests {
 
-    private static func card(_ id: ItemID, _ y: CGFloat, side: Liveness = .live) -> MarqueeTarget {
+    private static func card(_ id: ItemID, _ y: CGFloat, container: ItemContainer = .board) -> MarqueeTarget {
-        MarqueeTarget(id: id, kind: .card, side: side, frame: CGRect(x: 0, y: y, width: 100, height: 40))
+        MarqueeTarget(id: id, kind: .card, container: container, frame: CGRect(x: 0, y: y, width: 100, height: 40))
     }
 
-    private static func laneEntry(_ id: ItemID, _ y: CGFloat) -> MarqueeTarget {
+    @Test("On the board side the band takes intersecting cards, and only cards")
-        MarqueeTarget(id: id, kind: .lane, side: .trashed, frame: CGRect(x: 0, y: y, width: 100, height: 40))
+    func boardSideTakesCards() {
-    }
-
-    @Test("On the live side the band takes intersecting cards, and only cards")
-    func liveSideTakesCards() {
         let targets = [
             Self.card(card1, 0),
             Self.card(card2, 100),
             // A lane registered by mistake is still never swept: "click-drag rubber-bands across
             // lanes" (04-interactions.md § Selection) — across, not over.
-            MarqueeTarget(id: lane1, kind: .lane, side: .live, frame: CGRect(x: 0, y: 0, width: 200, height: 400)),
+            MarqueeTarget(id: lane1, kind: .lane, container: .board, frame: CGRect(x: 0, y: 0, width: 200, height: 400)),
             // A trash row cannot be reached by a band that began on the board.
-            Self.card(card3, 10, side: .trashed)
+            Self.card(card3, 10, container: .trash)
         ]
-        let ids = MarqueeMath.selection(rect: CGRect(x: 0, y: 0, width: 50, height: 120), targets: targets, side: .live)
+        let ids = MarqueeMath.selection(rect: CGRect(x: 0, y: 0, width: 50, height: 120), targets: targets, in: .board)
         #expect(ids == [card1, card2])
     }
 
-    @Test("On the trash side the topmost intersecting row's kind wins")
+    /// **There is no kind rule any more.** The tombstone model interleaved card rows and lane rows
-    func trashSideIsHomogeneousByKind() {
+    /// in one column, so the band needed a topmost-wins tie-break to stay homogeneous by kind; lanes
-        // Interleaved rows, the trash's own shape: card, lane, card.
+    /// are never trashed now, so both containers hold cards and one line serves both.
+    @Test("On the trash side the band takes the trash's cards, and stays on its own side")
+    func trashSideTakesItsOwnCards() {
         let targets = [
-            Self.card(card1, 0, side: .trashed),
+            Self.card(card1, 0, container: .trash),
-            Self.laneEntry(laneX, 50),
+            Self.card(card2, 100, container: .trash),
-            Self.card(card2, 100, side: .trashed)
+            Self.card(card3, 50)
         ]
         let all = CGRect(x: 0, y: 0, width: 50, height: 200)
 
-        // Begun on a card row: the lane row between the two cards is stepped over, exactly as a
+        #expect(MarqueeMath.selection(rect: all, targets: targets, in: .trash) == [card1, card2])
-        // ⇧-range does (04-interactions.md ▸ The trash).
+        #expect(MarqueeMath.selection(rect: all, targets: targets, in: .board) == [card3])
-        #expect(MarqueeMath.selection(rect: all, targets: targets, side: .trashed) == [card1, card2])
-
-        // Begun below it, so the lane row is topmost: only lane entries come back.
-        let lower = CGRect(x: 0, y: 60, width: 50, height: 200)
-        #expect(MarqueeMath.selection(rect: lower, targets: targets, side: .trashed) == [laneX])
     }
 
     @Test("A band touching nothing selects nothing")
     func emptyBand() {
         let targets = [Self.card(card1, 0), Self.card(card2, 100)]
-        #expect(MarqueeMath.selection(rect: CGRect(x: 500, y: 500, width: 10, height: 10), targets: targets, side: .live).isEmpty)
+        #expect(MarqueeMath.selection(rect: CGRect(x: 500, y: 500, width: 10, height: 10), targets: targets, in: .board).isEmpty)
-        #expect(MarqueeMath.selection(rect: .zero, targets: [], side: .trashed).isEmpty)
+        #expect(MarqueeMath.selection(rect: .zero, targets: [], in: .trash).isEmpty)
     }
 }
 
@@ -463,15 +435,15 @@ struct SelectionAnchorTests {
     func anchorDefaults() {
         let state = TransientBoardState()
 
-        state.select([card1], liveness: .live)
+        state.select([card1], in: .board)
         #expect(state.selectionAnchor == card1)
 
         // "A marquee and wholesale selections pass no anchor deliberately."
-        state.select([card1, card2], liveness: .live)
+        state.select([card1, card2], in: .board)
         #expect(state.selectionAnchor == nil)
 
         // An explicit anchor wins over the default in both directions.
-        state.select([card1, card2, card3], liveness: .live, anchor: card2)
+        state.select([card1, card2, card3], in: .board, anchor: card2)
         #expect(state.selectionAnchor == card2)
 
         state.clearSelection()
@@ -484,7 +456,7 @@ struct SelectionAnchorTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card1, card2], liveness: .live, anchor: card1)
+        store.select([card1, card2], in: .board, anchor: card1)
         // A survivor of the same reload proves the rule is about the anchor, not about reloading.
         try FileManager.default.removeItem(at: fixture.url("\(Ident.lane1)/\(Ident.card2)"))
         await reload(store)
@@ -497,17 +469,18 @@ struct SelectionAnchorTests {
         #expect(store.transient.selectionAnchor == nil)
     }
 
-    @Test("A liveness flip is a vanish for the anchor too")
+    @Test("A container crossing is a vanish for the anchor too")
-    func flippedAnchorIsDropped() async throws {
+    func crossedAnchorIsDropped() async throws {
         let fixture = try makeLiveBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card1, card2], liveness: .live, anchor: card1)
+        store.select([card1, card2], in: .board, anchor: card1)
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", tombstoned(order: "1024", title: "First"))
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
         await reload(store)
 
-        // "A flip is a vanish from its side of the boundary" (02-architecture.md's reload rule).
+        // "A container crossing is a vanish for this purpose" (02-architecture.md's reload rule,
+        // resettled 2026-07-28).
         #expect(store.selection.ids == [card2])
         #expect(store.transient.selectionAnchor == nil)
     }
@@ -520,7 +493,7 @@ struct SelectionAnchorTests {
         let state = TransientBoardState()
 
         // A ⌘-click that toggled the anchor's own row out leaves the anchor standing.
-        state.select([card2, card3], liveness: .live, anchor: card1)
+        state.select([card2, card3], in: .board, anchor: card1)
         #expect(state.selectionAnchor == card1)
         let outcome = click(target(card3, .card), .shift, selection: state.selection, anchor: state.selectionAnchor, in: snapshot)
         #expect(outcome.selection == set([card1, card2, card3]))
@@ -533,17 +506,17 @@ struct SelectionAnchorTests {
 @Suite("BoardStore ▸ Select All")
 struct SelectAllTests {
 
-    @Test("Select All takes every rendered card — tombstones excluded, lanes never")
+    @Test("Select All takes every rendered card, and never a lane")
     func liveBranch() throws {
         let fixture = try makeLiveBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([lane2], liveness: .live)
+        store.select([lane2], in: .board)
         store.selectAll()
 
         // "All visible cards on the board" (04-interactions.md ▸ The map).
-        #expect(store.selection == set([card1, card2, card3, card5]))
+        #expect(store.selection == set([card1, card2, card3, card4, card5]))
         // The lane the anchor named is not in the new set, so the anchor goes with it.
         #expect(store.transient.selectionAnchor == nil)
     }
@@ -554,25 +527,23 @@ struct SelectAllTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([card3], liveness: .live)
+        store.select([card3], in: .board)
         store.selectAll()
         #expect(store.transient.selectionAnchor == card3)
     }
 
-    @Test("On the trash side Select All stays within the selection's kind")
+    @Test("On the trash side Select All takes every visible trash card")
-    func trashBranchIsHomogeneousByKind() throws {
+    func trashBranchTakesTheColumn() throws {
         let fixture = try makeTrashBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
         store.transient.isTrashVisible = true
 
-        store.select([card2], liveness: .trashed)
+        // "With the trash visible and a non-empty trash selection, Select All selects all visible
+        // trash cards" (04 ▸ The map, resettled 2026-07-28). There is no kind clause left to honour.
+        store.select([card2], in: .trash)
         store.selectAll()
-        #expect(store.selection == set([card1, card2, card3], .trashed))
+        #expect(store.selection == set([card1, card2, card3], .trash))
-
-        store.select([laneX], liveness: .trashed)
-        store.selectAll()
-        #expect(store.selection == set([laneX, laneY], .trashed))
     }
 
     @Test("The trash branch is narrow: hidden, live, empty, or ghost selections take the board")
@@ -582,20 +553,20 @@ struct SelectAllTests {
         let store = try BoardStore(rootURL: fixture.root)
 
         // Hidden — the column is invisible to every gesture (04 ▸ The trash).
-        store.select([card1], liveness: .trashed)
+        store.select([card1], in: .trash)
         store.selectAll()
-        #expect(store.selection.liveness == .live)
+        #expect(store.selection.container == .board)
 
-        // Shown, but nothing tombstoned is selected.
+        // Shown, but nothing in the trash is selected.
         store.transient.isTrashVisible = true
         store.clearSelection()
         store.selectAll()
-        #expect(store.selection.liveness == .live)
+        #expect(store.selection.container == .board)
 
-        // Shown, trashed side, but the ids name no row: a guess would be worse than the board.
+        // Shown, trash side, but the ids name no card there: a guess would be worse than the board.
-        store.select([card5], liveness: .trashed)
+        store.select([card5], in: .trash)
         store.selectAll()
-        #expect(store.selection.liveness == .live)
+        #expect(store.selection.container == .board)
     }
 
     @Test("Select All on a board with no rendered cards clears rather than selecting an empty set")
@@ -606,7 +577,7 @@ struct SelectAllTests {
         try fixture.item(Ident.lane1, Item.rich(order: "1024", title: "Todo"))
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.select([lane1], liveness: .live)
+        store.select([lane1], in: .board)
         store.selectAll()
         #expect(store.selection.isEmpty)
         #expect(store.transient.selectionAnchor == nil)

KanbanTests/StyleModelTests.swift

@@ -109,7 +109,7 @@ struct StyleEditorSessionTests {
         let store = try BoardStore(rootURL: fixture.root)
         store.transient.beginStyleEditor(for: .items([card1, card2]))
 
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)", tombstoned(order: "2048", title: "Second"))
+        try fixture.move("\(Ident.lane1)/\(Ident.card2)", toTrash: Ident.card2)
         await reload(store)
 
         let session = try #require(store.transient.styleEditor)
@@ -126,7 +126,7 @@ struct StyleEditorSessionTests {
         let store = try BoardStore(rootURL: fixture.root)
         store.transient.beginStyleEditor(for: .items([card3]))
 
-        try fixture.item(Ident.lane2, tombstoned(order: "2048", title: "Doing"))
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane2))
         await reload(store)
 
         // The card's own flag never changed — its lane's did. Effective liveness is ancestor-walked,
@@ -141,7 +141,7 @@ struct StyleEditorSessionTests {
         let store = try BoardStore(rootURL: fixture.root)
         store.transient.beginStyleEditor(for: .items([card1]))
 
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", tombstoned(order: "1024", title: "First"))
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
         await reload(store)
 
         #expect(store.transient.styleEditor?.target != .board)
@@ -155,8 +155,8 @@ struct StyleEditorSessionTests {
         let store = try BoardStore(rootURL: fixture.root)
         store.transient.beginStyleEditor(for: .board)
 
-        try fixture.item(Ident.lane1, tombstoned(order: "1024", title: "Todo"))
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane1))
-        try fixture.item(Ident.lane2, tombstoned(order: "2048", title: "Doing"))
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane2))
         await reload(store)
 
         #expect(store.transient.styleEditor?.target == .board)

KanbanTests/StyleWriteTests.swift

@@ -54,9 +54,9 @@ private func makeBoard() throws -> WriterFixture {
     try fixture.item("\(Ident.lane1)/\(Ident.card1)", styled(order: "1024", title: "First", keys: ["background: fern", "iconColor: chalk"]))
     try fixture.item("\(Ident.lane1)/\(Ident.card2)", styled(order: "2048", title: "Second"))
     try fixture.item(Ident.lane2, styled(order: "2048", title: "Doing", keys: ["background: chalk", "icon: tray"]))
-    try fixture.item("\(Ident.lane2)/\(Ident.card3)", styled(order: "1024", title: "Third", keys: ["deleted: 2026-03-03T09:00:00Z"]))
+    try fixture.item("\(Ident.lane2)/\(Ident.card3)", styled(order: "1024", title: "Third"))
     try fixture.item(Ident.lane3, Item.uneditable)
-    try fixture.item(Ident.lane4, styled(order: "4096", title: "Gone", keys: ["deleted: 2026-03-03T09:00:00Z"]))
+    try fixture.item(Ident.lane4, styled(order: "4096", title: "Gone"))
     try fixture.item("\(Ident.lane4)/\(Ident.card4)", styled(order: "1024", title: "Hidden"))
     return fixture
 }
@@ -256,26 +256,27 @@ struct StyleWriteTests {
         #expect(lane(lane1, in: model)?.background.isMissing == true)
     }
 
-    @Test("Vanished, tombstoned and hidden targets are skipped silently")
+    @Test("Vanished and trashed targets are skipped silently")
     func skipsTargetsThatRenderNowhere() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
+        try fixture.move("\(Ident.lane2)/\(Ident.card3)", toTrash: Ident.card3)
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane4))
         let store = try BoardStore(rootURL: fixture.root)
         let log = BracketLog()
         log.attach(to: store)
-        let tombstoned = try fixture.indexData("\(Ident.lane2)/\(Ident.card3)")
+        let trashedBytes = try fixture.indexData(".trash/\(Ident.card3)")
-        let hidden = try fixture.indexData("\(Ident.lane4)/\(Ident.card4)")
 
-        // An id that names nothing, a tombstoned card, and a live card under a tombstoned lane —
+        // An id that names nothing, and a card that has been moved to the trash — "everything
-        // "nothing is ever written into a vanished folder", ancestor walk included.
+        // edit-shaped is disabled on trash selections" (04 ▸ The trash), and "nothing is ever
+        // written into a vanished folder".
         store.applyStyle(
             to: .items([ItemID(rawValue: Ident.indexless), card3, card4]),
             background: .set("obsidian")
         )
 
         #expect(log.begins == 0)
-        #expect(try fixture.indexData("\(Ident.lane2)/\(Ident.card3)") == tombstoned)
+        #expect(try fixture.indexData(".trash/\(Ident.card3)") == trashedBytes)
-        #expect(try fixture.indexData("\(Ident.lane4)/\(Ident.card4)") == hidden)
         #expect(store.banners.oneShots.isEmpty)
     }
 
@@ -314,13 +315,13 @@ struct StyleWriteTests {
 
     // MARK: Subjects and levels
 
-    @Test("Subjects are the live targets in display order, with their current values")
+    @Test("Subjects are the board's targets in display order, with their current values")
-    func subjectsAreLiveTargetsInDisplayOrder() throws {
+    func subjectsAreBoardTargetsInDisplayOrder() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        let subjects = store.styleSubjects(of: .items([card2, card1, card3, lane1]))
+        let subjects = store.styleSubjects(of: .items([card2, card1, lane1]))
         #expect(subjects.map(\.id) == [lane1, card1, card2], "lane first, then its cards top to bottom")
         #expect(subjects.map(\.background) == [.missing, .valid("fern"), .missing])
         #expect(subjects.last?.folder.lastPathComponent == Ident.card2)

KanbanTests/TaskCheckboxWriteTests.swift

@@ -328,19 +328,19 @@ struct StoreToggleTaskMarkerTests {
         #expect(try fixture.indexData(cardPath) == before)
     }
 
-    @Test("A tombstoned card's checkbox does not write")
+    @Test("A trashed card's checkbox does not write")
-    func aTombstonedCardWritesNothing() throws {
+    func aTrashedCardWritesNothing() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        try BoardWriter.deleteItem(at: fixture.url(cardPath))
+        try fixture.move(cardPath, toTrash: Ident.card1)
         let store = try BoardStore(rootURL: fixture.root)
-        let before = try body(of: fixture, cardPath)
+        let before = try body(of: fixture, ".trash/\(Ident.card1)")
         let offsets = markerOffsets(in: checklistBody)
 
-        // Effective liveness, ancestor-walked (`BoardStore.liveItem`): a card in the trash renders
+        // `BoardStore.boardItem` is the board container and only it: a trashed card does not open,
-        // nowhere, so nothing may write through a preview of it.
+        // so nothing may write through a preview of one (03 ▸ Trash's no-editing rule).
         store.toggleTaskMarker(inCard: ItemID(rawValue: Ident.card1), bodyOffset: offsets[0], checked: false)
 
-        #expect(try body(of: fixture, cardPath) == before)
+        #expect(try body(of: fixture, ".trash/\(Ident.card1)") == before)
     }
 }

KanbanTests/TransientBoardStateTests.swift

@@ -76,9 +76,9 @@ struct TransientBoardStateTests {
         // Overlapping but different: card1 is selected and cut, card2 is selected and dragged,
         // card3 is dragged and cut. Whatever happens to one member, two of the three sets are
         // always the control.
-        store.transient.select([card1, card2], liveness: .live)
+        store.transient.select([card1, card2], in: .board)
-        store.transient.dragMembers = ItemReferenceSet(ids: [card2, card3], liveness: .live)
+        store.transient.dragMembers = ItemReferenceSet(ids: [card2, card3], container: .board)
-        store.transient.pendingCut = ItemReferenceSet(ids: [card1, card3], liveness: .live)
+        store.transient.pendingCut = ItemReferenceSet(ids: [card1, card3], container: .board)
 
         try FileManager.default.removeItem(at: fixture.url("\(Ident.lane1)/\(Ident.card1)"))
         await reload(store)
@@ -98,7 +98,7 @@ struct TransientBoardStateTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        let seeded = ItemReferenceSet(ids: [card1, card2], liveness: .live)
+        let seeded = ItemReferenceSet(ids: [card1, card2], container: .board)
 
         // Direction one — the live search filter (04-interactions.md § Search): card1's title and
         // body both miss the query, so it is not in the visible set the predicate produced, and
@@ -116,74 +116,70 @@ struct TransientBoardStateTests {
         #expect(filtered == resolved, "one primitive, two universes — the two rules are one rule")
     }
 
-    @Test("Tombstoning a lane ejects its cards from every referencing set — liveness is effective")
+    @Test("A container crossing is a vanish for every item-referencing set")
-    func effectiveLivenessEjectsFromEverySet() async throws {
+    func aContainerCrossingEjectsFromEverySet() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.transient.select([card1, card2], liveness: .live)
+        store.transient.select([card1, card2], in: .board)
-        store.transient.pendingCut = ItemReferenceSet(ids: [card2, card3], liveness: .live)
+        store.transient.pendingCut = ItemReferenceSet(ids: [card2, card3], container: .board)
 
-        try fixture.item(Ident.lane1, tombstoned(order: "1024", title: "Todo"))
+        // A foreign writer moves card1 and card2 into the board's trash — the move a delete is.
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
+        try fixture.move("\(Ident.lane1)/\(Ident.card2)", toTrash: Ident.card2)
         await reload(store)
 
-        // The cards' own flags never changed, but their lane's did — and liveness is ancestor-walked
+        // 02-architecture.md § Live-reload resilience, resettled 2026-07-28: "re-resolution matches
-        // (02, settled): they render nowhere once 03 collapses the lane to a single trash entry, and
+        // UUID *and* container side … a foreign move that trashes a selected board card ejects it
-        // nothing invisible may stay selected or pending-cut.
+        // from the selection (and from the pending cut)".
-        let survivor = store.snapshot.lanes.first { $0.id == lane1 }?.cards.first { $0.id == card1 }
+        let trashedIDs = Set(store.snapshot.trash.map(\.id))
-        #expect(survivor?.isDeleted == false, "the card's own flag is untouched")
+        #expect(trashedIDs == Set([card1, card2]))
         #expect(store.transient.selection.ids.isEmpty)
-        #expect(store.transient.pendingCut.ids == [card3], "card3's lane is untouched, so card3 stays cut")
+        #expect(store.transient.pendingCut.ids == [card3], "card3 never moved, so card3 stays cut")
     }
 
-    @Test("A card with its own deleted: under a tombstoned lane is in neither universe")
+    @Test("A restore ejects a trash-side set the same way, in the other direction")
-    func ownFlaggedCardUnderATombstonedLaneIsInNeitherUniverse() async throws {
+    func restoringEjectsATrashSideSet() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
+        try fixture.move("\(Ident.lane2)/\(Ident.card3)", toTrash: Ident.card3)
         let store = try BoardStore(rootURL: fixture.root)
 
-        // Everything that can point at an item, all aimed at card3 — and on the *trashed* side, as
+        // Everything that can point at an item, all aimed at the trashed card.
-        // if the user had clicked its trash row a moment before its lane went too.
+        store.transient.select([card3], in: .trash, anchor: card3, head: card3)
-        store.transient.select([card3], liveness: .trashed, anchor: card3, head: card3)
+        store.transient.dragMembers = ItemReferenceSet(ids: [card3], container: .trash)
-        store.transient.dragMembers = ItemReferenceSet(ids: [card3], liveness: .trashed)
+        store.transient.pendingCut = ItemReferenceSet(ids: [card3], container: .trash)
-        store.transient.pendingCut = ItemReferenceSet(ids: [card3], liveness: .trashed)
         store.transient.beginRename(of: card3, currentTitle: "Third")
+        #expect(store.snapshot.trash.map(\.id) == [card3])
 
-        // Both flags at once: the card carries its own `deleted:` *and* an agent tombstones its lane.
+        // An agent moves it back out — a container crossing the other way.
-        try fixture.item("\(Ident.lane2)/\(Ident.card3)", tombstoned(order: "1024", title: "Third"))
+        try fixture.move(".trash/\(Ident.card3)", toLane: Ident.lane2, card: Ident.card3)
-        try fixture.item(Ident.lane2, tombstoned(order: "2048", title: "Doing"))
         await reload(store)
 
-        let lane = try #require(store.snapshot.lanes.first { $0.id == lane2 })
+        #expect(store.snapshot.trash.isEmpty)
-        #expect(lane.isDeleted)
+        #expect(!ItemContainer.trash.ids(in: store.snapshot).contains(card3))
-        #expect(lane.cards.first { $0.id == card3 }?.isDeleted == true, "the card's own flag is on disk")
+        #expect(ItemContainer.board.ids(in: store.snapshot).contains(card3),
+                "presence is the whole test — the card is simply on the other side now")
 
-        // The lane's single entry subsumes it (03-board-ui.md's absolute ancestor walk), so it has
-        // no row — and "the trashed side has exactly one definition: the set with trash rows"
-        // (02-architecture.md, settled). No row, no membership, on either side.
-        #expect(!TrashModel.entries(of: store.snapshot).map(\.id).contains(card3))
-        #expect(!ItemReferenceSet.idUniverse(of: store.snapshot, on: .trashed).contains(card3))
-        #expect(!ItemReferenceSet.idUniverse(of: store.snapshot, on: .live).contains(card3))
-
-        // So every set holding it is ejected — from the trashed side here, and from the live side
-        // for the same reason, which the value function says directly since a set has one side.
         #expect(store.transient.selection.ids.isEmpty)
         #expect(store.transient.dragMembers.ids.isEmpty)
         #expect(store.transient.pendingCut.ids.isEmpty)
-        #expect(ItemReferenceSet(ids: [card3], liveness: .live).resolved(against: store.snapshot).isEmpty)
 
-        // And no cursor or editor survives on it: an anchor that ranges from somewhere the board
+        // And no cursor survives on it: an anchor that ranges from a container the selection has left
-        // draws nowhere would be a range the user cannot see the origin of.
+        // would be a range the user cannot see the origin of.
         #expect(store.transient.selectionAnchor == nil)
         #expect(store.transient.selectionHead == nil)
-        #expect(store.transient.renameEditor == nil)
 
-        // Menu validation agrees, which is the point of the sets and the commands reading one rule:
+        // The rename editor tracks the *board* container, so a card arriving back on the board keeps
-        // neither ⌘⌫ twin offers to act on it.
+        // its editor — "a foreign move mid-rename is invisible" (04 ▸ Grammar). It is the departure
-        let stale = ItemReferenceSet(ids: [card3], liveness: .trashed)
+        // into the trash that discards it, which the delete tests cover.
-        #expect(!TrashModel.canActOnTrash(selection: stale, in: store.snapshot))
+        #expect(store.transient.renameEditor?.targetID == card3)
-        #expect(!TrashModel.canDelete(selection: ItemReferenceSet(ids: [card3], liveness: .live),
+
+        // Menu validation agrees with the sets, which is the point of both reading one rule.
+        let stale = ItemReferenceSet(ids: [card3], container: .trash)
+        #expect(!TrashModel.canDelete(selection: stale, in: store.snapshot))
+        #expect(TrashModel.canDelete(selection: ItemReferenceSet(ids: [card3], container: .board),
                                      in: store.snapshot))
     }
 
@@ -193,9 +189,9 @@ struct TransientBoardStateTests {
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
-        store.transient.select([card1, lane1], liveness: .live)
+        store.transient.select([card1, lane1], in: .board)
-        store.transient.dragMembers = ItemReferenceSet(ids: [card2], liveness: .live)
+        store.transient.dragMembers = ItemReferenceSet(ids: [card2], container: .board)
-        store.transient.pendingCut = ItemReferenceSet(ids: [card3], liveness: .live)
+        store.transient.pendingCut = ItemReferenceSet(ids: [card3], container: .board)
         store.transient.beginPlaceholder(inLane: lane2)
 
         try FileManager.default.removeItem(at: fixture.url(Ident.lane1))
@@ -238,13 +234,12 @@ struct TransientBoardStateTests {
         store.transient.beginPlaceholder(inLane: lane2)
         store.transient.updateDraft("Half a title")
 
-        try fixture.item(Ident.lane2, tombstoned(order: "2048", title: "Doing"))
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane2))
         await reload(store)
 
-        // Still in the snapshot — the trash renders its single entry — but the lane the editor was
+        // A lane delete is physical (03-board-ui.md § Trash), so "the placeholder's lane vanished in
-        // sitting in is not on the board any more, which is the same vanish as far as an overlay
+        // the reload" is literally the whole test.
-        // anchored to it is concerned.
+        #expect(store.snapshot.lanes.first { $0.id == lane2 } == nil)
-        #expect(store.snapshot.lanes.first { $0.id == lane2 }?.isDeleted == true)
         #expect(store.transient.newCardPlaceholder == nil)
     }
 
@@ -376,37 +371,36 @@ struct TransientBoardStateTests {
         #expect(store.transient.renameEditor == nil)
     }
 
-    @Test("A rename whose target is tombstoned is discarded — a liveness flip is a vanish")
+    @Test("A rename whose target enters the trash is discarded — a container crossing is a vanish")
-    func renameDiscardedWhenItsTargetIsTombstoned() async throws {
+    func renameDiscardedWhenItsTargetIsTrashed() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
         store.transient.beginRename(of: card1, currentTitle: "First")
 
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", tombstoned(order: "1024", title: "First"))
+        try fixture.move("\(Ident.lane1)/\(Ident.card1)", toTrash: Ident.card1)
         await reload(store)
 
-        #expect(store.snapshot.lanes.first { $0.id == lane1 }?.cards.first { $0.id == card1 }?.isDeleted == true)
+        // 04 ▸ Grammar: "a target that is trashed, deleted, or gone at commit time discards the
+        // editor and its keystrokes silently — entering the trash is a vanish from the board".
+        #expect(store.snapshot.trash.map(\.id) == [card1])
         #expect(store.transient.renameEditor == nil)
     }
 
-    @Test("A rename under a tombstoned lane is discarded too — liveness is effective")
+    @Test("A rename whose lane is deleted is discarded too — the card went with it")
-    func renameDiscardedWhenItsLaneIsTombstoned() async throws {
+    func renameDiscardedWhenItsLaneIsDeleted() async throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let store = try BoardStore(rootURL: fixture.root)
 
         store.transient.beginRename(of: card1, currentTitle: "First")
 
-        try fixture.item(Ident.lane1, tombstoned(order: "1024", title: "Todo"))
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane1))
         await reload(store)
 
-        // The card's own flag never changed; its lane's did. The ancestor walk is absolute — the
+        // A lane delete is physical, so the card is simply not in the snapshot — no ancestor walk.
-        // card renders nowhere, so the editor sitting on it has no target
+        #expect(store.snapshot.lanes.first { $0.id == lane1 } == nil)
-        // (`CardWindowHost.cardWindowFate`'s rule, applied to the third inline editor).
-        let card = store.snapshot.lanes.first { $0.id == lane1 }?.cards.first { $0.id == card1 }
-        #expect(card?.isDeleted == false)
         #expect(store.transient.renameEditor == nil)
     }
 
@@ -457,17 +451,17 @@ struct TransientBoardStateTests {
 
         #expect(store.transient.lastActiveLaneID == nil, "a fresh board has no history to remember")
 
-        store.select([lane2], liveness: .live)
+        store.select([lane2], in: .board)
         #expect(store.transient.lastActiveLaneID == lane2)
 
         // A *card* selection is its lane holding selection too — 04's "the lane that most recently
         // held selection or a creation".
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
         #expect(store.transient.lastActiveLaneID == lane1)
 
         // A cross-lane selection names no single lane, so it leaves the memory alone rather than
         // guessing at one of the two.
-        store.select([card1, card3], liveness: .live)
+        store.select([card1, card3], in: .board)
         #expect(store.transient.lastActiveLaneID == lane1)
 
         // Deselecting does not un-happen where the user was working: ⌘N with nothing selected is
@@ -485,11 +479,11 @@ struct TransientBoardStateTests {
         store.transient.beginPlaceholder(inLane: lane2)
         #expect(store.transient.lastActiveLaneID == lane2)
 
-        try fixture.item(Ident.lane2, tombstoned(order: "2048", title: "Doing"))
+        try FileManager.default.removeItem(at: fixture.url(Ident.lane2))
         await reload(store)
 
-        // A lane that renders nowhere is no target at all; `NewCardTarget` then falls through to
+        // A lane that is gone is no target at all; `NewCardTarget` then falls through to the first
-        // the first lane rather than proposing the trash.
+        // lane rather than proposing the trash.
         #expect(store.transient.lastActiveLaneID == nil)
     }
 

KanbanTests/TrashModelTests.swift

@@ -2,476 +2,364 @@ import Foundation
 import Testing
 @testable import Kanban
 
-/// `TrashModel` is the trash quasi-lane's whole heart, and it is a pure function — so this suite is
+/// What is left of the trash as a *model* once the trash became a folder — 03-board-ui.md § Trash,
-/// the executable form of 03-board-ui.md § Trash ▸ Contents: the deterministic sort, the absolute
+/// resettled 2026-07-28 (the materialized trash).
-/// ancestor walk, and what a lane entry's card count actually counts.
+///
+/// **The suite is much smaller than the tombstone model's was, and that is the finding.** The rows
+/// no longer need deriving — the trash's contents *are* `snapshot.trash`, parsed by the same card
+/// parse the lanes use and already in `order` display order — so the deterministic timestamp sort,
+/// the absolute ancestor walk, and the returning-card count all went with the entries they described.
+/// What remains is what the *commands* need: the two purge confirmations' phrasing, and the menu
+/// validation that stages Delete by place. Plus `ItemPath`, the location vocabulary that replaced
+/// `TrashModel.paths`.
 ///
 /// The snapshots are **loaded from real temp boards** rather than hand-built, for the reason every
-/// other model suite here does it: the interesting inputs are `FieldValue<Date>` shapes — a valid
+/// other model suite here does it: only the loader produces `.trash` the way production does.
-/// stamp, an unparseable one, an absent key — and only the loader produces those the way production
+/// `WriterFixture`, `Ident` and `Item` come from `WriterTestSupport.swift`.
-/// does. `WriterFixture`, `Ident` and `Item` come from `WriterTestSupport.swift`.
 
 // MARK: - Fixtures
 
-/// A few more literal identities than `Ident` offers: the sort tests need enough rows to prove an
+/// A few more literal identities than `Ident` offers — folder name is the display tie-break, so the
-/// *ordering* rather than a comparison, and folder name is the tie-break, so the names matter.
+/// names matter.
 private enum More {
     static let laneA = "aaaaaaaa-aaaa-4aaa-8aaa-aaaaaaaaaaaa"
-    static let laneB = "bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb"
     static let cardD = "dddddddd-dddd-4ddd-8ddd-dddddddddddd"
     static let cardE = "eeeeeeee-eeee-4eee-8eee-eeeeeeeeeeee"
     static let cardF = "ffffffff-ffff-4fff-8fff-ffffffffffff"
 }
 
-/// An item with a `deleted:` key — `stamp` goes in verbatim, so a test can write an unparseable one.
+private func card(order: String, title: String) -> String {
-private func tombstoned(order: String, title: String, deleted: String) -> String {
+    "---\nschema: 1\ntitle: \(title)\norder: \(order)\n---\n\(title) body.\n"
-    """
-    ---
-    schema: 1
-    title: \(title)
-    order: \(order)
-    deleted: \(deleted)
-    ---
-    \(title) body.
-
-    """
 }
 
-private func live(order: String, title: String) -> String {
+private func untitled(order: String) -> String {
-    "---\nschema: 1\ntitle: \(title)\norder: \(order)\n---\n\(title) body.\n"
+    "---\nschema: 1\norder: \(order)\n---\nNo title.\n"
 }
 
 private func load(_ fixture: WriterFixture) throws -> BoardModel {
     try BoardLoader.load(boardRoot: fixture.root).model
 }
 
-private func ids(_ entries: [TrashEntry]) -> [String] {
+/// One lane with two cards, and three cards in the board's trash.
-    entries.map(\.id.rawValue)
+@MainActor
-}
+private func makeBoard() throws -> WriterFixture {
-
-// MARK: - The sort
-
-@Suite("TrashModel ▸ sort")
-struct TrashModelSortTests {
-
-    @Test("Dated entries sort newest first, and lane entries interleave by their own stamp")
-    func newestFirstWithLanesInterleaved() throws {
-        let fixture = try WriterFixture()
-        defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)",
-                         tombstoned(order: "1024", title: "Oldest card", deleted: "2026-03-01T09:00:00Z"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)",
-                         tombstoned(order: "2048", title: "Newest card", deleted: "2026-03-03T09:00:00Z"))
-        // A tombstoned lane whose own stamp falls between the two cards': the sort is one ordering
-        // over both kinds, not cards-then-lanes.
-        try fixture.item(Ident.lane2,
-                         tombstoned(order: "2048", title: "Doing", deleted: "2026-03-02T09:00:00Z"))
-
-        let entries = TrashModel.entries(of: try load(fixture))
-        #expect(ids(entries) == [Ident.card2, Ident.lane2, Ident.card1])
-        #expect(entries[1].isLaneEntry)
-    }
-
-    @Test("Ties on the second break by folder name, ascending")
-    func tiesBreakByFolderName() throws {
-        let fixture = try WriterFixture()
-        defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        // One multi-card ⌫ stamps one second onto N cards. The three are written in an order that
-        // is neither their folder-name order nor their `order` order, so only the rule can produce
-        // the expectation below.
-        let stamp = "2026-03-03T09:00:00Z"
-        try fixture.item("\(Ident.lane1)/\(More.cardF)", tombstoned(order: "1024", title: "F", deleted: stamp))
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", tombstoned(order: "2048", title: "5", deleted: stamp))
-        try fixture.item("\(Ident.lane1)/\(More.cardD)", tombstoned(order: "3072", title: "D", deleted: stamp))
-
-        let entries = TrashModel.entries(of: try load(fixture))
-        #expect(ids(entries) == [Ident.card1, More.cardD, More.cardF])
-    }
-
-    @Test("An unparseable stamp sorts oldest — after every dated entry, however old")
-    func unparseableSortsOldest() throws {
-        let fixture = try WriterFixture()
-        defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)",
-                         tombstoned(order: "1024", title: "Corrupt", deleted: "whenever"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)",
-                         tombstoned(order: "2048", title: "Ancient", deleted: "1999-01-01T00:00:00Z"))
-
-        let model = try load(fixture)
-        // The premise: the key is present but has no date reading — still a tombstone (presence,
-        // not validity), and still with no position in time.
-        let corrupt = try #require(model.lanes.first?.cards.first { $0.id.rawValue == Ident.card1 })
-        #expect(corrupt.isDeleted)
-        #expect(corrupt.deleted.value == nil)
-
-        // A corrupt stamp must not outrank a fresh deletion for the trash's most prominent rows —
-        // and here it does not even outrank a 1999 one.
-        #expect(ids(TrashModel.entries(of: model)) == [Ident.card2, Ident.card1])
-    }
-
-    @Test("Undated entries order by folder name among themselves, lanes included")
-    func undatedOrderByFolderName() throws {
-        let fixture = try WriterFixture()
-        defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
-        try fixture.item(More.laneB, tombstoned(order: "3072", title: "B lane", deleted: "not-a-date"))
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        try fixture.item("\(Ident.lane1)/\(More.cardE)", tombstoned(order: "1024", title: "E", deleted: "corrupt"))
-        try fixture.item(More.laneA, tombstoned(order: "2048", title: "A lane", deleted: "later"))
-
-        // `a… < b… < e…`: one folder-name ordering across both kinds, exactly as the dated half has
-        // one date ordering across both kinds.
-        #expect(ids(TrashModel.entries(of: try load(fixture))) == [More.laneA, More.laneB, More.cardE])
-    }
-}
-
-// MARK: - The ancestor walk and the returning count
-
-@Suite("TrashModel ▸ contents")
-struct TrashModelContentsTests {
-
-    /// The board every test below reads: one live lane holding a tombstoned card and a live one, and
-    /// one tombstoned lane holding a live card, a card with its own flag, and another live card.
-    private func makeBoard() throws -> WriterFixture {
     let fixture = try WriterFixture()
     try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
+    try fixture.item(More.laneA, card(order: "1024", title: "Todo"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)",
+    try fixture.item("\(More.laneA)/\(Ident.card1)", card(order: "1024", title: "First"))
-                         tombstoned(order: "1024", title: "Trashed card", deleted: "2026-03-03T09:00:00Z"))
+    try fixture.item("\(More.laneA)/\(Ident.card2)", card(order: "2048", title: "Second"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)", live(order: "2048", title: "Live card"))
+    // Newest-first by ordinary ranks: every arrival mints above the current top.
-        try fixture.item(Ident.lane2,
+    try fixture.item(".trash/\(More.cardD)", card(order: "1024", title: "Oldest"))
-                         tombstoned(order: "2048", title: "Doing", deleted: "2026-03-02T09:00:00Z"))
+    try fixture.item(".trash/\(More.cardE)", card(order: "512", title: "Middle"))
-        try fixture.item("\(Ident.lane2)/\(Ident.card3)", live(order: "1024", title: "Rides along"))
+    try fixture.item(".trash/\(More.cardF)", card(order: "256", title: "Newest"))
-        try fixture.item("\(Ident.lane2)/\(More.cardD)",
-                         tombstoned(order: "2048", title: "Own flag", deleted: "2026-03-04T09:00:00Z"))
-        try fixture.item("\(Ident.lane2)/\(More.cardE)", live(order: "3072", title: "Rides along too"))
     return fixture
-    }
+}
 
-    @Test("A card with its own deleted: under a tombstoned lane has no row — the walk is absolute")
+private let laneA = ItemID(rawValue: More.laneA)
-    func ownFlagUnderTombstonedLaneHasNoRow() throws {
+private let card1 = ItemID(rawValue: Ident.card1)
+private let card2 = ItemID(rawValue: Ident.card2)
+private let cardD = ItemID(rawValue: More.cardD)
+private let cardE = ItemID(rawValue: More.cardE)
+private let cardF = ItemID(rawValue: More.cardF)
+
+// MARK: - The contents
+
+/// **There is no derivation left to test** — so what this suite pins instead is that the container
+/// *is* the list, in the order the column shows it, which is the pivot's whole claim.
+@MainActor
+@Suite("The trash's contents are the container")
+struct TrashContentsTests {
+
+    @Test("The trash is `snapshot.trash`, newest first by ordinary ranks")
+    func theContainerIsTheList() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
 
-        let entries = TrashModel.entries(of: try load(fixture))
+        #expect(snapshot.trash.compactMap(\.title.value) == ["Newest", "Middle", "Oldest"],
-        // `cardD`'s stamp is the newest on the board, so if it had a row at all it would be the
+                "03 ▸ Trash: the trash sorts by `order` like any lane, and entry is at the top")
-        // first one. The lane's single entry subsumes it instead.
+        #expect(snapshot.trash.allSatisfy { $0.deleted.isMissing },
-        #expect(ids(entries) == [Ident.card1, Ident.lane2])
+                "there is no `deleted:` key and no timestamp sort")
-        #expect(!ids(entries).contains(More.cardD))
     }
 
-    @Test("A lane entry counts what Put Back returns — cards without their own flag")
+    @Test("Lanes are never in it, whatever a hand-editor nests in there")
-    func returningCountExcludesOwnFlaggedCards() throws {
+    func lanesAreNeverTrashed() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
+        // A lane-shaped nesting inside `.trash/` is a stray by construction: the container holds
+        // card folders directly, and the walk does not descend.
+        try fixture.item(".trash/\(Ident.lane3)/\(Ident.card4)", card(order: "1024", title: "Nested"))
+        let snapshot = try load(fixture)
 
-        let entries = TrashModel.entries(of: try load(fixture))
+        #expect(!snapshot.trash.map(\.id).contains(ItemID(rawValue: Ident.card4)))
-        let lane = try #require(entries.first { $0.id.rawValue == Ident.lane2 })
+        #expect(snapshot.lanes.map(\.id) == [laneA], "and nothing in there is a lane")
-        guard case let .lane(_, returning) = lane else {
-            Issue.record("expected a lane entry")
-            return
-        }
-        // Three cards sit in the folder; two come back with the lane. The third comes back to the
-        // *trash*, which is why it is not in this number.
-        #expect(returning == 2)
     }
 
-    @Test("A lane entry with nothing to return counts zero rather than being suppressed")
+    @Test("An absent container is an empty trash")
-    func emptyLaneEntryCountsZero() throws {
+    func absentIsEmpty() throws {
         let fixture = try WriterFixture()
         defer { fixture.tearDown() }
         try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, tombstoned(order: "1024", title: "Empty", deleted: "2026-03-03T09:00:00Z"))
+        try fixture.item(More.laneA, card(order: "1024", title: "Todo"))
 
-        let entries = TrashModel.entries(of: try load(fixture))
+        #expect(try load(fixture).trash.isEmpty)
-        #expect(entries.count == 1)
-        guard case let .lane(_, returning) = entries[0] else {
-            Issue.record("expected a lane entry")
-            return
-        }
-        #expect(returning == 0)
-    }
-
-    @Test("An empty trash is empty, and a board with any tombstone is not")
-    func emptiness() throws {
-        let clean = try WriterFixture()
-        defer { clean.tearDown() }
-        try clean.item("", Item.board)
-        try clean.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        try clean.item("\(Ident.lane1)/\(Ident.card1)", live(order: "1024", title: "Card"))
-        #expect(TrashModel.isEmpty(try load(clean)))
-        #expect(TrashModel.entries(of: try load(clean)).isEmpty)
-
-        let dirty = try makeBoard()
-        defer { dirty.tearDown() }
-        #expect(!TrashModel.isEmpty(try load(dirty)))
-    }
-
-    @Test("Paths resolve on the row set's liveness side, in display order")
-    func pathsResolveByEffectiveLiveness() throws {
-        let fixture = try makeBoard()
-        defer { fixture.tearDown() }
-        let model = try load(fixture)
-        let everything: Set<ItemID> = [
-            ItemID(rawValue: Ident.lane1), ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2),
-            ItemID(rawValue: Ident.lane2), ItemID(rawValue: Ident.card3), ItemID(rawValue: More.cardD),
-        ]
-
-        // Live: the live lane and its live card. `card3` is live by its own flag but its lane is
-        // tombstoned, so the ancestor walk takes it off this side.
-        let liveSide = TrashModel.paths(of: everything, on: .live, in: model)
-        #expect(liveSide.map { ($0.laneID.rawValue, $0.cardID?.rawValue) }.map { "\($0.0)/\($0.1 ?? "-")" }
-            == ["\(Ident.lane1)/-", "\(Ident.lane1)/\(Ident.card2)"])
-
-        // Trashed: the tombstoned card and the tombstoned lane — the trash's two rows, in display
-        // order, lanes left to right and each lane before its cards. Nothing under `lane2` is here:
-        // its cards have no rows, and the lane's *folder* is what takes them (Put Back returns them
-        // with it; Delete Immediately purges them with it).
-        let trashedSide = TrashModel.paths(of: everything, on: .trashed, in: model)
-        #expect(trashedSide.map { "\($0.laneID.rawValue)/\($0.cardID?.rawValue ?? "-")" }
-            == ["\(Ident.lane1)/\(Ident.card1)", "\(Ident.lane2)/-"])
-
-        #expect(TrashModel.paths(of: [], on: .live, in: model).isEmpty)
-        #expect(TrashModel.paths(of: [ItemID(rawValue: Ident.indexless)], on: .trashed, in: model).isEmpty)
-    }
-
-    @Test("The trashed universe is exactly the trash's rows — one function, not two")
-    func trashedUniverseIsTheRowSet() throws {
-        let fixture = try makeBoard()
-        defer { fixture.tearDown() }
-        let model = try load(fixture)
-
-        // The guarantee 02-architecture.md settles: "universe and rows are one function, never a
-        // broader set with a pointer-side subset". Anything a set may reference on the trashed side
-        // is something the quasi-lane draws.
-        let rows = Set(TrashModel.entries(of: model).map(\.id))
-        let trashed = ItemReferenceSet.idUniverse(of: model, on: .trashed)
-        #expect(trashed == rows)
-
-        // And the two universes therefore do **not** partition the board. `cardD` carries its own
-        // `deleted:` under a tombstoned lane and `card3` rides along unflagged under the same one;
-        // both render nowhere, so neither is on either side.
-        let liveUniverse = ItemReferenceSet.idUniverse(of: model, on: .live)
-        for hidden in [ItemID(rawValue: More.cardD), ItemID(rawValue: Ident.card3)] {
-            #expect(!rows.contains(hidden))
-            #expect(!trashed.contains(hidden))
-            #expect(!liveUniverse.contains(hidden))
-            #expect(ItemReferenceSet(ids: [hidden], liveness: .trashed).resolved(against: model).isEmpty)
-            #expect(ItemReferenceSet(ids: [hidden], liveness: .live).resolved(against: model).isEmpty)
-        }
-
-        // Paths are the same walk in folder form, so they name the same things — one per row.
-        #expect(TrashModel.paths(of: rows, on: .trashed, in: model).count == rows.count)
-        #expect(TrashModel.emptyTrashTargets(in: model).count == rows.count)
-        // And `isEmpty`'s short-circuit is that walk's non-emptiness, on both a dirty board and a
-        // clean one.
-        #expect(TrashModel.isEmpty(model) == rows.isEmpty)
-
-        let clean = try WriterFixture()
-        defer { clean.tearDown() }
-        try clean.item("", Item.board)
-        try clean.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        let cleanModel = try load(clean)
-        #expect(TrashModel.isEmpty(cleanModel) == TrashModel.entries(of: cleanModel).isEmpty)
-        #expect(ItemReferenceSet.idUniverse(of: cleanModel, on: .trashed).isEmpty)
-    }
-
-    @Test("Empty Trash targets every tombstone, a tombstoned lane contributing only its own folder")
-    func emptyTrashTargets() throws {
-        let fixture = try makeBoard()
-        defer { fixture.tearDown() }
-
-        let targets = TrashModel.emptyTrashTargets(in: try load(fixture))
-        // The own-flag card inside the tombstoned lane is not listed — removing the lane folder
-        // takes it, and a second purge of a path that is already gone would be noise.
-        #expect(targets.map { "\($0.laneID.rawValue)/\($0.cardID?.rawValue ?? "-")" }
-            == ["\(Ident.lane1)/\(Ident.card1)", "\(Ident.lane2)/-"])
-        #expect(TrashModel.counts(of: targets) == TrashModel.EntryCounts(lanes: 1, cards: 1))
-    }
-
-    @Test("A path resolves under whichever root it is given")
-    func pathsResolveUnderTheGivenRoot() {
-        let root = URL(fileURLWithPath: "/tmp/Board.kanban")
-        let card = TrashModel.ItemPath(laneID: ItemID(rawValue: Ident.lane1), cardID: ItemID(rawValue: Ident.card1))
-        #expect(card.folder(under: root).path == "/tmp/Board.kanban/\(Ident.lane1)/\(Ident.card1)")
-        #expect(!card.isLane)
-
-        let lane = TrashModel.ItemPath(laneID: ItemID(rawValue: Ident.lane1), cardID: nil)
-        #expect(lane.folder(under: root).path == "/tmp/Board.kanban/\(Ident.lane1)")
-        #expect(lane.isLane)
     }
 }
 
-// MARK: - Counts, phrasing, and the confirmations
+// MARK: - ItemPath
+
+/// The location vocabulary that replaced `TrashModel.paths` — three cases because the board has
+/// exactly three places an identity-bearing folder can be.
+@MainActor
+@Suite("ItemPath")
+struct ItemPathTests {
+
+    @Test("Each case resolves to the folder it names")
+    func foldersResolve() throws {
+        let root = URL(fileURLWithPath: "/Boards/Work.kanban", isDirectory: true)
+
+        #expect(ItemPath.lane(laneA).folder(under: root).path == "/Boards/Work.kanban/\(More.laneA)")
+        #expect(ItemPath.card(lane: laneA, id: card1).folder(under: root).path
+            == "/Boards/Work.kanban/\(More.laneA)/\(Ident.card1)")
+        #expect(ItemPath.trashCard(cardD).folder(under: root).path
+            == "/Boards/Work.kanban/.trash/\(More.cardD)")
+    }
+
+    @Test("The container is the case, and only a lane is a lane")
+    func containerAndKind() {
+        #expect(ItemPath.lane(laneA).container == .board)
+        #expect(ItemPath.card(lane: laneA, id: card1).container == .board)
+        #expect(ItemPath.trashCard(cardD).container == .trash)
+
+        #expect(ItemPath.lane(laneA).isLane)
+        #expect(!ItemPath.card(lane: laneA, id: card1).isLane)
+        #expect(!ItemPath.trashCard(cardD).isLane)
+    }
+
+    @Test("Resolution is per container, in display order, skipping what is not there")
+    func resolutionIsPerContainer() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+        let everything: Set<ItemID> = [laneA, card1, card2, cardD, cardE, cardF]
+
+        #expect(ItemPath.resolve(everything, in: .board, snapshot: snapshot)
+            == [.lane(laneA), .card(lane: laneA, id: card1), .card(lane: laneA, id: card2)],
+            "lanes left to right, each lane then its cards — never the caller's set order")
+        #expect(ItemPath.resolve(everything, in: .trash, snapshot: snapshot)
+            == [.trashCard(cardF), .trashCard(cardE), .trashCard(cardD)],
+            "and the trash top to bottom")
+
+        #expect(ItemPath.resolve([], in: .board, snapshot: snapshot).isEmpty)
+        #expect(ItemPath.resolve([ItemID(rawValue: Ident.indexless)], in: .trash, snapshot: snapshot).isEmpty)
+    }
+
+    @Test("A lookup that spans containers finds an item wherever it is, and nothing where it is not")
+    func lookupSpansContainers() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+
+        #expect(ItemPath.of(laneA, in: snapshot) == .lane(laneA))
+        #expect(ItemPath.of(card1, in: snapshot) == .card(lane: laneA, id: card1))
+        #expect(ItemPath.of(cardD, in: snapshot) == .trashCard(cardD))
+        #expect(ItemPath.of(ItemID(rawValue: Ident.indexless), in: snapshot) == nil)
+    }
+}
+
+// MARK: - The universes
+
+@MainActor
+@Suite("ItemContainer ▸ the universe")
+struct ItemContainerUniverseTests {
+
+    @Test("The board's universe is its lanes and their cards; the trash's is its cards")
+    func universesArePresenceOnly() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+
+        #expect(ItemContainer.board.ids(in: snapshot) == [laneA, card1, card2])
+        #expect(ItemContainer.trash.ids(in: snapshot) == [cardD, cardE, cardF])
+    }
+
+    @Test("The two universes partition the board — nothing is in both, nothing is in neither")
+    func theyPartition() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+        let board = ItemContainer.board.ids(in: snapshot)
+        let trash = ItemContainer.trash.ids(in: snapshot)
+
+        #expect(board.isDisjoint(with: trash))
+        // The tombstone model's two sides deliberately did *not* partition — a card under a
+        // tombstoned lane was in neither. Presence being the whole test is what closed that gap.
+        var everything: Set<ItemID> = []
+        for lane in snapshot.lanes {
+            everything.insert(lane.id)
+            for card in lane.cards { everything.insert(card.id) }
+        }
+        for card in snapshot.trash { everything.insert(card.id) }
+        #expect(board.union(trash) == everything)
+    }
+}
+
+// MARK: - Phrasing
 
 @Suite("TrashModel ▸ phrasing")
-struct TrashModelPhrasingTests {
+struct TrashPhrasingTests {
 
-    @Test("Plural folding reads counts, singular and plural, cards and lanes and both")
+    @Test("Plurals fold, and there is only one noun left to fold")
     func pluralFolding() {
-        #expect(TrashModel.phrase(.init(lanes: 0, cards: 41)) == "41 cards")
+        #expect(TrashModel.phrase(1) == "1 card")
-        #expect(TrashModel.phrase(.init(lanes: 0, cards: 1)) == "1 card")
+        #expect(TrashModel.phrase(41) == "41 cards")
-        #expect(TrashModel.phrase(.init(lanes: 1, cards: 0)) == "1 lane")
+        #expect(TrashModel.phrase(0) == "0 cards")
-        #expect(TrashModel.phrase(.init(lanes: 3, cards: 0)) == "3 lanes")
-        #expect(TrashModel.phrase(.init(lanes: 2, cards: 3)) == "2 lanes and 3 cards")
-        #expect(TrashModel.phrase(.init(lanes: 1, cards: 1)) == "1 lane and 1 card")
-        #expect(TrashModel.phrase(.init()) == "nothing")
     }
 
-    @Test("Entry counts split lane entries from card entries")
+    @MainActor
-    func entryCounts() throws {
+    @Test("A sole card is named; several fold into a count")
-        let fixture = try WriterFixture()
+    func purgePromptNamesOrCounts() throws {
+        let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
+        let snapshot = try load(fixture)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)",
-                         tombstoned(order: "1024", title: "One", deleted: "2026-03-01T09:00:00Z"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)",
-                         tombstoned(order: "2048", title: "Two", deleted: "2026-03-02T09:00:00Z"))
-        try fixture.item(Ident.lane2, tombstoned(order: "2048", title: "Gone", deleted: "2026-03-03T09:00:00Z"))
-
-        let counts = TrashModel.counts(of: TrashModel.entries(of: try load(fixture)))
-        #expect(counts == TrashModel.EntryCounts(lanes: 1, cards: 2))
-        #expect(counts.total == 3)
-        #expect(!counts.isEmpty)
-    }
-
-    @Test("Delete Immediately names a sole item and folds several into counts")
-    func purgePrompt() throws {
-        let fixture = try WriterFixture()
-        defer { fixture.tearDown() }
-        try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)",
-                         tombstoned(order: "1024", title: "Fix login", deleted: "2026-03-01T09:00:00Z"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)",
-                         tombstoned(order: "2048", title: "Ship it", deleted: "2026-03-02T09:00:00Z"))
-        try fixture.item(Ident.lane2, tombstoned(order: "2048", title: "Doing", deleted: "2026-03-03T09:00:00Z"))
-        let model = try load(fixture)
 
         let sole = try #require(TrashModel.purgePrompt(
-            for: [ItemID(rawValue: Ident.card1)], in: model, unrecoverable: true))
+            for: [cardF], in: .trash, snapshot: snapshot, unrecoverable: true
-        #expect(sole.title == "Permanently delete \u{201C}Fix login\u{201D}?")
+        ))
+        #expect(sole.title == "Permanently delete \u{201C}Newest\u{201D}?")
         #expect(sole.message == "This can\u{2019}t be undone.")
         #expect(sole.confirmTitle == "Delete")
 
         let several = try #require(TrashModel.purgePrompt(
-            for: [ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.card2)],
+            for: [cardE, cardF], in: .trash, snapshot: snapshot, unrecoverable: true
-            in: model, unrecoverable: true))
+        ))
         #expect(several.title == "Permanently delete 2 cards?")
-
-        // A lane in the set earns the sentence that matters most: the row says how many cards come
-        // *back*, while a purge takes every card in the folder.
-        let withLane = try #require(TrashModel.purgePrompt(
-            for: [ItemID(rawValue: Ident.card1), ItemID(rawValue: Ident.lane2)],
-            in: model, unrecoverable: true))
-        #expect(withLane.title == "Permanently delete 1 lane and 1 card?")
-        #expect(withLane.message.hasPrefix("Deleting a lane also deletes every card inside it."))
-
-        // m7-git: a board whose history keeps the content says so instead.
-        let recoverable = try #require(TrashModel.purgePrompt(
-            for: [ItemID(rawValue: Ident.card1)], in: model, unrecoverable: false))
-        #expect(recoverable.message == "The board\u{2019}s history still has them.")
-
-        // Nothing tombstoned in the set: no prompt, which is also the command's own refusal.
-        #expect(TrashModel.purgePrompt(for: [ItemID(rawValue: Ident.lane1)], in: model, unrecoverable: true) == nil)
-        #expect(TrashModel.purgePrompt(for: [], in: model, unrecoverable: true) == nil)
     }
 
-    @Test("An untitled item is named by its rendering, never by an empty string")
+    @MainActor
-    func untitledPrompt() throws {
+    @Test("Delete Immediately reads the same either side of the boundary")
+    func purgePromptSpansContainers() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+
+        let fromBoard = try #require(TrashModel.purgePrompt(
+            for: [card1], in: .board, snapshot: snapshot, unrecoverable: true
+        ))
+        #expect(fromBoard.title == "Permanently delete \u{201C}First\u{201D}?",
+                "11 ▸ Delete Immediately skips the trash from anywhere")
+    }
+
+    @MainActor
+    @Test("A lane in the set contributes nothing — no purge path reaches one")
+    func lanesAreNeverPurged() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+
+        #expect(TrashModel.purgePrompt(for: [laneA], in: .board, snapshot: snapshot, unrecoverable: true) == nil)
+    }
+
+    @MainActor
+    @Test("An untitled card reads as the untitled rendering, never as an empty pair of quotes")
+    func untitledReadsAsARendering() throws {
         let fixture = try WriterFixture()
         defer { fixture.tearDown() }
         try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
+        try fixture.item(More.laneA, card(order: "1024", title: "Todo"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)",
+        try fixture.item(".trash/\(More.cardD)", untitled(order: "1024"))
-                         "---\nschema: 1\norder: 1024\ndeleted: 2026-03-01T09:00:00Z\n---\nbody\n")
+        let snapshot = try load(fixture)
 
         let prompt = try #require(TrashModel.purgePrompt(
-            for: [ItemID(rawValue: Ident.card1)], in: try load(fixture), unrecoverable: true))
+            for: [cardD], in: .trash, snapshot: snapshot, unrecoverable: true
+        ))
         #expect(prompt.title == "Permanently delete \u{201C}Untitled\u{201D}?")
     }
 
-    @Test("Empty Trash names the whole trash's count and refuses on an empty one")
+    @MainActor
+    @Test("A set naming nothing raises no prompt — the refusal and the action agree")
+    func nothingToPurgeRaisesNothing() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+
+        #expect(TrashModel.purgePrompt(
+            for: [ItemID(rawValue: Ident.indexless)], in: .trash, snapshot: snapshot, unrecoverable: true
+        ) == nil)
+        #expect(TrashModel.purgePrompt(for: [], in: .board, snapshot: snapshot, unrecoverable: true) == nil)
+    }
+
+    @MainActor
+    @Test("Empty Trash names the true count, and the message follows recoverability")
     func emptyTrashPrompt() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let snapshot = try load(fixture)
+
+        let unrecoverable = try #require(TrashModel.emptyTrashPrompt(in: snapshot, unrecoverable: true))
+        #expect(unrecoverable.title == "Permanently delete 3 cards?")
+        #expect(unrecoverable.message == "This can\u{2019}t be undone.")
+
+        let recoverable = try #require(TrashModel.emptyTrashPrompt(in: snapshot, unrecoverable: false))
+        #expect(recoverable.message == "The board\u{2019}s history still has them.")
+    }
+
+    @MainActor
+    @Test("An empty trash raises no Empty Trash prompt")
+    func emptyTrashOnAnEmptyTrash() throws {
         let fixture = try WriterFixture()
         defer { fixture.tearDown() }
         try fixture.item("", Item.board)
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
+        try fixture.item(More.laneA, card(order: "1024", title: "Todo"))
-        #expect(TrashModel.emptyTrashPrompt(in: try load(fixture), unrecoverable: true) == nil)
 
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)",
+        #expect(TrashModel.emptyTrashPrompt(in: try load(fixture), unrecoverable: true) == nil)
-                         tombstoned(order: "1024", title: "One", deleted: "2026-03-01T09:00:00Z"))
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)",
-                         tombstoned(order: "2048", title: "Two", deleted: "2026-03-02T09:00:00Z"))
-        let prompt = try #require(TrashModel.emptyTrashPrompt(in: try load(fixture), unrecoverable: true))
-        // Counts even for a small trash: the command is about the trash, not about an item.
-        #expect(prompt.title == "Permanently delete 2 cards?")
     }
 }
 
 // MARK: - Menu validation
 
+@MainActor
 @Suite("TrashModel ▸ validation")
-struct TrashModelValidationTests {
+struct TrashValidationTests {
 
-    private func makeBoard() throws -> WriterFixture {
+    /// **One Delete, one predicate.** The tombstone model needed a mirror-image pair so two ⌘⌫ twins
-        let fixture = try WriterFixture()
+    /// could enable exactly one of themselves; Put Back's retirement left one item, so the predicate
-        try fixture.item("", Item.board)
+    /// is "does this selection name anything", asked in the selection's own container.
-        try fixture.item(Ident.lane1, live(order: "1024", title: "Todo"))
+    @Test("Delete enables for either container, and for nothing that names nothing")
-        try fixture.item("\(Ident.lane1)/\(Ident.card1)", live(order: "1024", title: "Live"))
+    func canDeleteIsStagedNotSplit() throws {
-        try fixture.item("\(Ident.lane1)/\(Ident.card2)",
-                         tombstoned(order: "2048", title: "Trashed", deleted: "2026-03-01T09:00:00Z"))
-        return fixture
-    }
-
-    @Test("The ⌘⌫ twins enable exactly one of themselves, by the selection's liveness side")
-    func chordTwinsAreBinary() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        let model = try load(fixture)
+        let snapshot = try load(fixture)
 
-        let liveSelection = ItemReferenceSet(ids: [ItemID(rawValue: Ident.card1)], liveness: .live)
+        #expect(TrashModel.canDelete(selection: ItemReferenceSet(ids: [card1], container: .board), in: snapshot))
-        #expect(TrashModel.canDelete(selection: liveSelection, in: model))
+        #expect(TrashModel.canDelete(selection: ItemReferenceSet(ids: [laneA], container: .board), in: snapshot))
-        #expect(!TrashModel.canActOnTrash(selection: liveSelection, in: model))
+        #expect(TrashModel.canDelete(selection: ItemReferenceSet(ids: [cardD], container: .trash), in: snapshot))
 
-        let trashedSelection = ItemReferenceSet(ids: [ItemID(rawValue: Ident.card2)], liveness: .trashed)
+        #expect(!TrashModel.canDelete(selection: .empty, in: snapshot))
-        #expect(!TrashModel.canDelete(selection: trashedSelection, in: model))
+        // A selection the next reload will drop: the id is real, but not in the container it claims.
-        #expect(TrashModel.canActOnTrash(selection: trashedSelection, in: model))
+        #expect(!TrashModel.canDelete(
+            selection: ItemReferenceSet(ids: [card1], container: .trash), in: snapshot
+        ))
+        #expect(!TrashModel.canDelete(
+            selection: ItemReferenceSet(ids: [cardD], container: .board), in: snapshot
+        ))
     }
 
-    @Test("Neither enables on an empty selection, or on one whose members have gone")
+    @Test("Delete Immediately is cards only, in either container")
-    func nothingToActOn() throws {
+    func canDeleteImmediatelyIsCardsOnly() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
-        let model = try load(fixture)
+        let snapshot = try load(fixture)
 
-        #expect(!TrashModel.canDelete(selection: .empty, in: model))
+        #expect(TrashModel.canDeleteImmediately(
-        #expect(!TrashModel.canActOnTrash(selection: ItemReferenceSet(ids: [], liveness: .trashed), in: model))
+            selection: ItemReferenceSet(ids: [card1], container: .board), in: snapshot
-
+        ))
-        // A selection the next reload will drop: the id names nothing, so the item that would write
+        #expect(TrashModel.canDeleteImmediately(
-        // nothing does not look available.
+            selection: ItemReferenceSet(ids: [cardD], container: .trash), in: snapshot
-        let stale = ItemReferenceSet(ids: [ItemID(rawValue: Ident.indexless)], liveness: .live)
+        ))
-        #expect(!TrashModel.canDelete(selection: stale, in: model))
+        #expect(!TrashModel.canDeleteImmediately(
-    }
+            selection: ItemReferenceSet(ids: [laneA], container: .board), in: snapshot
-
+        ), "a lane's delete is physical already — there is nothing for 'skip the trash' to mean")
-    @Test("A selection whose side disagrees with the item's own flag enables neither")
+        #expect(!TrashModel.canDeleteImmediately(selection: .empty, in: snapshot))
-    func sideMustMatch() throws {
-        let fixture = try makeBoard()
-        defer { fixture.tearDown() }
-        let model = try load(fixture)
-
-        // The homogeneous-by-liveness invariant makes this unreachable through the UI, and the
-        // reload rule ejects it if a foreign edit ever produces it — but the predicates must not
-        // trust that, since they are what stands between a stale set and a write.
-        let wrongSide = ItemReferenceSet(ids: [ItemID(rawValue: Ident.card1)], liveness: .trashed)
-        #expect(!TrashModel.canActOnTrash(selection: wrongSide, in: model))
-        #expect(!TrashModel.canDelete(selection: wrongSide, in: model))
     }
 }

KanbanTests/UndoWriteTests.swift

@@ -18,7 +18,10 @@ import Testing
 
 // MARK: - Fixtures
 
-private func tombstoned(order: String, title: String, deleted: String = "2026-03-03T09:00:00Z") -> String {
+/// A card sitting in `<root>/.trash/` — an ordinary card in a special place (03-board-ui.md §
+/// Trash), with the unknown-key overlay every other fixture card carries so an inverse's
+/// verbatim-preservation claim has something to preserve.
+private func trashResident(order: String, title: String) -> String {
     """
     ---
     schema: 1
@@ -26,7 +29,6 @@ private func tombstoned(order: String, title: String, deleted: String = "2026-03
     order: \(order)
     project: lanework       # agent overlay
     created: 2026-01-01T09:00:00Z
-    deleted: \(deleted)
     ---
     \(title) body.
 
@@ -47,8 +49,8 @@ Styled body.
 
 """
 
-/// Two live lanes — the first with two live cards, a styled one and a tombstoned one; the second
+/// Two lanes — the first with two plain cards and a styled one, the second with one card — plus one
-/// with one card. Enough for every inverse in this file.
+/// card already sitting in the board's `.trash/`. Enough for every inverse in this file.
 @MainActor
 private func makeBoard() throws -> WriterFixture {
     let fixture = try WriterFixture()
@@ -57,9 +59,9 @@ private func makeBoard() throws -> WriterFixture {
     try fixture.item("\(Ident.lane1)/\(Ident.card1)", Item.rich(order: "1024", title: "First"))
     try fixture.item("\(Ident.lane1)/\(Ident.card2)", Item.rich(order: "2048", title: "Second"))
     try fixture.item("\(Ident.lane1)/\(Ident.card3)", styledCard)
-    try fixture.item("\(Ident.lane1)/\(Ident.card4)", tombstoned(order: "4096", title: "Trashed"))
     try fixture.item(Ident.lane2, Item.rich(order: "2048", title: "Doing"))
     try fixture.item("\(Ident.lane2)/\(Ident.indexless)", Item.rich(order: "1024", title: "Elsewhere"))
+    try fixture.item(".trash/\(Ident.card4)", trashResident(order: "1024", title: "Trashed"))
     return fixture
 }
 
@@ -74,7 +76,7 @@ private let elsewhere = ItemID(rawValue: Ident.indexless)
 private let card1Path = "\(Ident.lane1)/\(Ident.card1)"
 private let card2Path = "\(Ident.lane1)/\(Ident.card2)"
 private let card3Path = "\(Ident.lane1)/\(Ident.card3)"
-private let trashedPath = "\(Ident.lane1)/\(Ident.card4)"
+private let trashedPath = ".trash/\(Ident.card4)"
 
 /// A store with a stack behind it. The provider is returned because `BoardStore.history` is **weak**
 /// — the session owns the stack in the app, and a test that dropped it would watch its own steps
@@ -488,7 +490,7 @@ struct MoveUndoTests {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let (store, history) = try makeStore(fixture)
-        store.select([card1], liveness: .live)
+        store.select([card1], in: .board)
 
         store.sortSelection(.down)
 
@@ -506,13 +508,13 @@ struct MoveUndoTests {
     }
 }
 
-// MARK: - The trash pair
+// MARK: - Delete
 
 @MainActor
-@Suite("Undo ▸ the trash pair")
+@Suite("Undo ▸ delete")
 struct TrashUndoTests {
 
-    @Test("Undoing a delete is Put Back — the key goes, and nothing else moves")
+    @Test("Undoing a card delete moves it back out of the trash, to its lane and its rank")
     func deleteRoundTrip() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
@@ -520,20 +522,42 @@ struct TrashUndoTests {
         let before = try fixture.indexText(card1Path)
 
         store.delete([card1])
-        #expect(try document(fixture, card1Path).deleted.value != nil)
+        #expect(!fixture.exists(card1Path), "the folder physically left its lane")
+        #expect(fixture.exists(".trash/\(Ident.card1)"))
         #expect(history.undoActionName == "Delete Card")
 
         history.undo()
+        #expect(fixture.exists(card1Path), "13 ▸ Interaction with the trash: the undo is the move back")
+        #expect(!fixture.exists(".trash/\(Ident.card1)"))
         let undone = try fixture.indexText(card1Path)
-        #expect(try FrontmatterDocument.parse(undone).deleted.isMissing)
+        #expect(try FrontmatterDocument.parse(undone).order.value == 1024, "at its original rank")
-        // Byte-identical but for the stamp: the tombstone and its inverse are one key each.
+        // Byte-identical but for the stamps every app write owns — no `deleted:` key was ever
-        #expect(untouchedLines(undone).filter { !$0.hasPrefix("deleted:") } == untouchedLines(before))
+        // written, so there is none to come back and none to remove.
+        #expect(untouchedLines(undone) == untouchedLines(before))
 
         history.redo()
-        #expect(try document(fixture, card1Path).deleted.value != nil)
+        #expect(fixture.exists(".trash/\(Ident.card1)"))
+        #expect(!fixture.exists(card1Path))
     }
 
-    @Test("A multi-item delete is one step with a plural title")
+    @Test("The redo files the card under the rank the delete minted, not a fresh one")
+    func redoUsesTheCapturedTrashRank() throws {
+        let fixture = try makeBoard()
+        defer { fixture.tearDown() }
+        let (store, history) = try makeStore(fixture)
+
+        store.delete([card1])
+        let minted = try #require(try document(fixture, ".trash/\(Ident.card1)").order.value)
+        #expect(minted < 1024, "entry is at the top: a rank above the current topmost (order 1024)")
+
+        history.undo()
+        history.redo()
+
+        #expect(try document(fixture, ".trash/\(Ident.card1)").order.value == minted,
+                "the redo replays the write's own captured rank")
+    }
+
+    @Test("A multi-card delete is one step with a plural title, and lands newest-last on top")
     func batchDeleteIsOneStep() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
@@ -542,69 +566,74 @@ struct TrashUndoTests {
         store.delete([card1, card2])
 
         #expect(history.undoActionName == "Delete 2 Cards")
+        let first = try #require(try document(fixture, ".trash/\(Ident.card1)").order.value)
+        let second = try #require(try document(fixture, ".trash/\(Ident.card2)").order.value)
+        #expect(second < first, "each arrival in the run mints a rank above the one before it")
+
         history.undo()
-        #expect(try document(fixture, card1Path).deleted.isMissing)
+        #expect(fixture.exists(card1Path))
-        #expect(try document(fixture, card2Path).deleted.isMissing)
+        #expect(fixture.exists(card2Path))
+        #expect(try loadedTrash(fixture).map(\.id) == [trashed], "only the board's own resident is left")
         #expect(history.canUndo == false)
     }
 
-    @Test("A lane delete is named for the lane")
+    @Test("A lane delete is physical, and its undo recreates the folder byte for byte")
-    func laneDeleteIsNamedForTheLane() throws {
+    func laneDeleteRecreatesTheSubtree() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let (store, history) = try makeStore(fixture)
+        let laneText = try fixture.indexText(Ident.lane2)
+        let cardText = try fixture.indexText("\(Ident.lane2)/\(Ident.indexless)")
 
         store.delete([lane2])
 
+        #expect(!fixture.exists(Ident.lane2), "03 ▸ Trash: deleting a lane deletes it, physically")
+        #expect(try loadedTrash(fixture).map(\.id) == [trashed], "lanes are never trashed")
         #expect(history.undoActionName == "Delete Lane")
+
         history.undo()
-        #expect(try document(fixture, Ident.lane2).deleted.isMissing)
+
+        #expect(fixture.exists(Ident.lane2))
+        #expect(try fixture.indexText(Ident.lane2) == laneText, "the capture replays bytes, it does not edit")
+        #expect(try fixture.indexText("\(Ident.lane2)/\(Ident.indexless)") == cardText,
+                "and the whole subtree comes back with it — nested cards included")
+
+        history.redo()
+        #expect(!fixture.exists(Ident.lane2))
     }
 
-    @Test("Undoing a Put Back re-tombstones with the timestamp the row was filed under")
+    @Test("A restore-by-move-out registers as an ordinary Move, with the ordinary move inverse")
-    func putBackRoundTrip() throws {
+    func restoreIsAnOrdinaryMove() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let (store, history) = try makeStore(fixture)
-        let filedUnder = try #require(try document(fixture, trashedPath).deleted.value)
+        let trashRank = try #require(try document(fixture, trashedPath).order.value)
 
-        store.putBack([trashed])
+        store.moveCards([trashed], toLane: lane2, at: 0)
-        #expect(try document(fixture, trashedPath).deleted.isMissing)
-        #expect(history.undoActionName == "Restore Card")
 
-        history.undo()
-        #expect(try document(fixture, trashedPath).deleted.value == filedUnder,
-                "the trash sorts by this — a fresh stamp would reorder a list the user was reading")
-
-        history.redo()
-        #expect(try document(fixture, trashedPath).deleted.isMissing)
-    }
-
-    @Test("Drag-to-restore undoes the position half too")
-    func restoreByDragRoundTrip() throws {
-        let fixture = try makeBoard()
-        defer { fixture.tearDown() }
-        let (store, history) = try makeStore(fixture)
-        let filedUnder = try #require(try document(fixture, trashedPath).deleted.value)
-
-        store.restoreByDrag(cardID: trashed, intoLane: lane2, at: 0)
         #expect(fixture.exists("\(Ident.lane2)/\(Ident.card4)"))
-        #expect(try document(fixture, "\(Ident.lane2)/\(Ident.card4)").deleted.isMissing)
+        #expect(!fixture.exists(trashedPath))
-        #expect(history.undoActionName == "Restore Card")
+        #expect(history.undoActionName == "Move Card",
+                "13: a restore is an ordinary move between containers, named as one")
 
         history.undo()
-        #expect(fixture.exists(trashedPath), "back in the lane it was trashed in")
+        #expect(fixture.exists(trashedPath), "back in the trash it came out of")
-        #expect(fixture.exists("\(Ident.lane2)/\(Ident.card4)") == false)
+        #expect(!fixture.exists("\(Ident.lane2)/\(Ident.card4)"))
-        let undone = try document(fixture, trashedPath)
+        #expect(try document(fixture, trashedPath).order.value == trashRank,
-        #expect(undone.deleted.value == filedUnder)
+                "at the rank it was filed under")
-        #expect(undone.order.value == 4096, "at the rank it was trashed holding")
 
         history.redo()
         #expect(fixture.exists("\(Ident.lane2)/\(Ident.card4)"))
-        #expect(try document(fixture, "\(Ident.lane2)/\(Ident.card4)").deleted.isMissing)
     }
 }
 
+/// The board's trash as the loader reads it — never the store's snapshot, which a write deliberately
+/// does not touch.
+@MainActor
+private func loadedTrash(_ fixture: WriterFixture) throws -> [Card] {
+    try BoardLoader.load(boardRoot: fixture.root).model.trash
+}
+
 // MARK: - The Edit session
 
 @MainActor
@@ -703,6 +732,7 @@ struct NotUndoableTests {
         store.delete([card1])
         let armed = try #require(history.undoActionName)
 
+        store.select([trashed], in: .trash)
         store.deleteImmediately([trashed])
 
         #expect(fixture.exists(trashedPath) == false)
@@ -758,7 +788,7 @@ struct NotUndoableTests {
         store.delete([card1])
         store.setLaneWidth(lane1, units: 2)
 
-        #expect(try document(fixture, card1Path).deleted.value != nil)
+        #expect(fixture.exists(".trash/\(Ident.card1)"))
         #expect(try document(fixture, Ident.lane1).width.value == 2)
         #expect(store.banners.oneShots.isEmpty)
     }
@@ -803,9 +833,9 @@ struct CrossingIsAWriteTests {
         store.delete([card1])
         for _ in 0 ..< 3 {
             history.undo()
-            #expect(try document(fixture, card1Path).deleted.isMissing)
+            #expect(fixture.exists(card1Path))
             history.redo()
-            #expect(try document(fixture, card1Path).deleted.value != nil)
+            #expect(fixture.exists(".trash/\(Ident.card1)"))
         }
     }
 }
@@ -840,8 +870,15 @@ private enum Foreign {
         _ = try BoardWriter.writeBody(inItemFolder: fixture.url(path), body: body)
     }
 
-    static func delete(_ fixture: WriterFixture, _ path: String) throws {
+    /// A foreign delete of a **card** — the shape a delete has on disk now: the folder moves into
-        try BoardWriter.deleteItem(at: fixture.url(path))
+    /// `.trash/`. `FileManager` and nothing else, so no rank is minted and no stamp is written.
+    static func trash(_ fixture: WriterFixture, _ path: String, id: String) throws {
+        try fixture.move(path, toTrash: id)
+    }
+
+    /// A foreign delete of a **lane** — physical, since lanes are never trashed.
+    static func removeLane(_ fixture: WriterFixture, _ path: String) throws {
+        try FileManager.default.removeItem(at: fixture.url(path))
     }
 
     static func purge(_ fixture: WriterFixture, _ path: String) throws {
@@ -886,12 +923,13 @@ struct StaleStepTests {
         store.transient.updateRenameDraft("Second!")
         store.commitRename()
 
-        try Foreign.delete(fixture, card2Path)
+        try Foreign.trash(fixture, card2Path, id: Ident.card2)
         history.undo()
 
         // The top step's card is in the trash now, so its rename is not ours to walk back; the one
         // below it is untouched and applies in the same ⌘Z.
-        #expect(try document(fixture, card2Path).title.value == "Second!", "the foreign writer's board, left alone")
+        #expect(try document(fixture, ".trash/\(Ident.card2)").title.value == "Second!",
+                "the foreign writer's board, left alone")
         #expect(try document(fixture, card1Path).title.value == "First", "⌘Z fell through and did something")
         #expect(store.banners.signposts.map(\.message)
             == ["Undo skipped — 'Second!' changed outside Lanework"])
@@ -906,29 +944,33 @@ struct StaleStepTests {
         let (store, history) = try makeStore(fixture)
 
         store.delete([card1])
-        try Foreign.purge(fixture, card1Path)
+        try Foreign.purge(fixture, ".trash/\(Ident.card1)")
 
         history.undo()
 
         #expect(fixture.exists(card1Path) == false)
+        #expect(!fixture.exists(".trash/\(Ident.card1)"))
         #expect(store.banners.signposts.count == 1)
         #expect(store.banners.oneShots.isEmpty, "a skip is not a write failure — no error row")
         #expect(history.canUndo == false)
         #expect(history.canRedo == false, "a skipped step leaves nothing behind")
     }
 
-    @Test("A foreign Put Back skips the delete's undo — the item is not on the side we left it")
+    /// The container check, and it needs no field of its own: a delete step's undo expects its card
+    /// at `<root>/.trash/<id>`, and a foreign restore leaves that path empty (`HistoryStaleness`).
+    @Test("A foreign restore skips the delete's undo — the card is not in the container we left it")
     func aForeignRestoreSkipsTheDeleteStep() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let (store, history) = try makeStore(fixture)
 
         store.delete([card1])
-        try BoardWriter.restoreItem(at: fixture.url(card1Path))
+        try fixture.move(".trash/\(Ident.card1)", toLane: Ident.lane2, card: Ident.card1)
 
         history.undo()
 
-        #expect(try document(fixture, card1Path).deleted.isMissing, "still live, as they left it")
+        #expect(fixture.exists("\(Ident.lane2)/\(Ident.card1)"), "where the foreign writer put it")
+        #expect(!fixture.exists(card1Path), "and not moved back on top of them")
         #expect(store.banners.signposts.map(\.message) == ["Undo skipped — 'First' changed outside Lanework"])
     }
 
@@ -949,23 +991,25 @@ struct StaleStepTests {
         #expect(history.canUndo == false)
     }
 
-    @Test("A tombstoned card is stale for a field edit, even with the field itself untouched")
+    @Test("A foreign lane delete is stale for a field edit — there is nothing at the path")
-    func aTombstonedTargetIsStaleForAFieldEdit() throws {
+    func aRemovedLaneIsStaleForAFieldEdit() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let (store, history) = try makeStore(fixture)
 
         store.setLaneWidth(lane1, units: 3)
-        try Foreign.delete(fixture, Ident.lane1)
+        try Foreign.removeLane(fixture, Ident.lane1)
 
         history.undo()
 
-        #expect(try document(fixture, Ident.lane1).width.value == 3, "not resized inside the trash")
+        #expect(!fixture.exists(Ident.lane1), "not conjured back to be resized")
         #expect(store.banners.signposts.count == 1)
     }
 
-    @Test("A card under a foreign-tombstoned lane is stale too — liveness is ancestor-walked")
+    /// The card's own path is the check: a lane delete is physical, so a card under it is simply not
-    func anAncestorTombstoneIsStale() throws {
+    /// there any more — no ancestor walk, which is what materializing the trash bought.
+    @Test("A card whose lane a foreign writer deleted is stale too")
+    func aCardUnderARemovedLaneIsStale() throws {
         let fixture = try makeBoard()
         defer { fixture.tearDown() }
         let (store, history) = try makeStore(fixture)
@@ -973,11 +1017,11 @@ struct StaleStepTests {
         store.transient.beginRename(of: card1, currentTitle: "First")
         store.transient.updateRenameDraft("Renamed")
         store.commitRename()
-        try Foreign.delete(fixture, Ident.lane1)
+        try Foreign.removeLane(fixture, Ident.lane1)
 
         history.undo()
 
-        #expect(try document(fixture, card1Path).title.value == "Renamed", "the card renders nowhere; nothing was written")
+        #expect(!fixture.exists(card1Path), "the card is gone; nothing was written")
         #expect(store.banners.signposts.count == 1)
     }
 
@@ -1014,7 +1058,7 @@ struct StaleStepTests {
         store.commitRename()
 
         try Foreign.rename(fixture, card2Path, to: "Theirs")
-        try Foreign.delete(fixture, card3Path)
+        try Foreign.trash(fixture, card3Path, id: Ident.card3)
         history.undo()
 
         #expect(try document(fixture, card1Path).title.value == "First", "the step applied")
@@ -1108,7 +1152,7 @@ struct StaleStepTests {
         let (store, history) = try makeStore(fixture)
 
         store.delete([card1])
-        try Foreign.purge(fixture, card1Path)
+        try Foreign.purge(fixture, ".trash/\(Ident.card1)")
         history.undo()
 
         let row = try #require(store.bannerRows.last)
@@ -1219,7 +1263,7 @@ struct FailedCrossingTests {
         try FileManager.default.setAttributes([.posixPermissions: 0o500], ofItemAtPath: fixture.url(card1Path).path)
         history.undo()
 
-        #expect(try document(fixture, card2Path).deleted.value != nil,
+        #expect(fixture.exists(".trash/\(Ident.card2)"),
                 "the step below was never reached — a refused disk is not a reason to attempt more")
         #expect(history.undoActionName == "Rename Card")
     }
@@ -1322,34 +1366,36 @@ struct HistoryPhraseTests {
 /// that the two doors reach one state rather than two similar ones, and that alternating between
 /// them leaves a stack that crosses cleanly in both directions.
 @MainActor
-@Suite("Undo ▸ the trash's two doors")
+@Suite("Undo ▸ the trash and the stack are the same folder moves")
 struct TrashInterplayTests {
 
-    @Test("Undoing a delete lands exactly where Put Back would have — the same bytes, not a near miss")
+    /// 13-native-undo.md ▸ Interaction with the trash: "The stack and the trash never conflict — they
+    /// are the same folder moves addressed by recency instead of by selection."
+    @Test("Undoing a delete lands exactly where a manual move-out would — the same bytes")
     func theTwoDoorsReachOneState() async throws {
         // Two identical boards, one per door: the claim is about a *state*, so the honest comparison
         // is the whole board read off disk, not the one field each path happens to write.
         let byUndo = try makeBoard()
         defer { byUndo.tearDown() }
-        let byPutBack = try makeBoard()
+        let byMove = try makeBoard()
-        defer { byPutBack.tearDown() }
+        defer { byMove.tearDown() }
         let origin = try boardTexts(byUndo)
 
         let (undoStore, history) = try makeStore(byUndo)
         undoStore.delete([card1])
         history.undo()
 
-        let (putBackStore, _) = try makeStore(byPutBack)
+        let (moveStore, _) = try makeStore(byMove)
-        putBackStore.delete([card1])
+        moveStore.delete([card1])
-        // Put Back reads the trashed side of the snapshot, so it has to see the tombstone first —
+        // The move-out reads the trash side of the snapshot, so it has to see the card arrive there
-        // which is the one-way flow, not a test artefact.
+        // first — which is the one-way flow, not a test artefact.
-        await reload(putBackStore)
+        await reload(moveStore)
-        putBackStore.putBack([card1])
+        moveStore.moveCards([card1], toLane: lane1, at: 0)
 
-        expectSameBoard(try boardTexts(byUndo), try boardTexts(byPutBack), "the two doors")
+        expectSameBoard(try boardTexts(byUndo), try boardTexts(byMove), "the two doors")
         expectSameBoard(try boardTexts(byUndo), origin, "undo against the board it started from")
-        #expect(try document(byUndo, card1Path).deleted.isMissing)
+        #expect(byUndo.exists(card1Path))
-        #expect(try document(byPutBack, card1Path).deleted.isMissing)
+        #expect(byMove.exists(card1Path))
     }
 
     @Test("Undoing a delete is position-preserving — the card comes back where it was, not at an end")
@@ -1358,25 +1404,25 @@ struct TrashInterplayTests {
         defer { fixture.tearDown() }
         let (store, history) = try makeStore(fixture)
 
-        /// The lane's live cards in display order, read through the loader — the order the board
+        /// The lane's cards in display order, read through the loader — the order the board actually
-        /// actually renders, rather than the ranks it is derived from.
+        /// renders, rather than the ranks it is derived from.
-        func liveCards() throws -> [String] {
+        func laneCards() throws -> [String] {
             let result = try BoardLoader.load(boardRoot: fixture.root)
             let lane = try #require(result.model.lanes.first { $0.id == lane1 })
-            return lane.cards.filter { !$0.isDeleted }.map(\.id.rawValue)
+            return lane.cards.map(\.id.rawValue)
         }
-        let before = try liveCards()
+        let before = try laneCards()
         #expect(before == [Ident.card1, Ident.card2, Ident.card3], "the middle card is genuinely in the middle")
 
         // The middle of three: an implementation that restored by appending would pass on a first or
         // last card and fail here.
         store.delete([card2])
         await reload(store)
-        #expect(try liveCards() == [Ident.card1, Ident.card3])
+        #expect(try laneCards() == [Ident.card1, Ident.card3])
 
         history.undo()
 
-        #expect(try liveCards() == before, "01's deletion bullet: restore is position-perfect")
+        #expect(try laneCards() == before, "13: the undo returns the card to its source lane and rank")
         #expect(try document(fixture, card2Path).order.value == 2048, "the rank it held all along")
     }
 
@@ -1387,30 +1433,27 @@ struct TrashInterplayTests {
         let (store, history) = try makeStore(fixture)
         let live = try boardTexts(fixture)
 
-        // Three gestures over one card, alternating the doors: ⌫, Put Back, ⌫.
+        // Three gestures over one card, alternating the doors: ⌫, move back out, ⌫.
         store.delete([card1])
         await reload(store)
-        let filedUnder = try #require(try document(fixture, card1Path).deleted.value)
+        #expect(fixture.exists(".trash/\(Ident.card1)"))
 
-        store.putBack([card1])
+        store.moveCards([card1], toLane: lane1, at: 0)
         await reload(store)
-        #expect(try document(fixture, card1Path).deleted.isMissing)
+        #expect(fixture.exists(card1Path))
 
         store.delete([card1])
         await reload(store)
         #expect(history.undoActionName == "Delete Card")
-        let trashed = try boardTexts(fixture)
+        let trashedBoard = try boardTexts(fixture)
 
-        // Back up the stack: delete → restore → tombstone → restore. The middle step is Put Back's
+        // Back up the stack: delete → move → delete, each crossed in reverse.
-        // inverse, which has to re-file the row under the stamp it was filed under rather than under
-        // now — the trash sorts by it.
         history.undo()
-        #expect(try document(fixture, card1Path).deleted.isMissing)
+        #expect(fixture.exists(card1Path))
-        #expect(history.undoActionName == "Restore Card")
+        #expect(history.undoActionName == "Move Card")
 
         history.undo()
-        #expect(try document(fixture, card1Path).deleted.value == filedUnder,
+        #expect(fixture.exists(".trash/\(Ident.card1)"), "back in the trash the move took it out of")
-                "re-tombstoned where it was filed, not where a fresh stamp would put it")
         #expect(history.undoActionName == "Delete Card")
 
         history.undo()
@@ -1419,12 +1462,12 @@ struct TrashInterplayTests {
 
         // And forward again, the same three steps in the other direction.
         history.redo()
-        #expect(try document(fixture, card1Path).deleted.value != nil)
+        #expect(fixture.exists(".trash/\(Ident.card1)"))
         history.redo()
-        #expect(try document(fixture, card1Path).deleted.isMissing)
+        #expect(fixture.exists(card1Path))
         history.redo()
         #expect(history.canRedo == false)
-        expectSameBoard(try boardTexts(fixture), trashed, "three doors forward")
+        expectSameBoard(try boardTexts(fixture), trashedBoard, "three doors forward")
         #expect(store.banners.signposts.isEmpty, "nothing was stale: the doors never collided")
         #expect(store.banners.oneShots.isEmpty)
     }

KanbanTests/WriterTestSupport.swift

@@ -93,6 +93,29 @@ struct WriterFixture {
     func entryNames(_ relativePath: String) throws -> [String] {
         try FileManager.default.contentsOfDirectory(atPath: url(relativePath).path).sorted()
     }
+
+    /// Moves a folder from one place in the board to another — a **foreign** move, the way an agent
+    /// or a hand-editor makes one: `FileManager` and nothing else, no `index.md` rewritten, no rank
+    /// touched. What the container-crossing rules are stated in terms of (02-architecture.md §
+    /// Live-reload resilience, resettled 2026-07-28).
+    func moveFolder(_ relativePath: String, to destinationPath: String) throws {
+        let destination = url(destinationPath)
+        try FileManager.default.createDirectory(
+            at: destination.deletingLastPathComponent(),
+            withIntermediateDirectories: true
+        )
+        try FileManager.default.moveItem(at: url(relativePath), to: destination)
+    }
+
+    /// A card folder moved into `<root>/.trash/` — the shape of a delete on disk, made foreignly.
+    func move(_ relativePath: String, toTrash cardName: String) throws {
+        try moveFolder(relativePath, to: ".trash/\(cardName)")
+    }
+
+    /// A card folder moved out of the trash into a lane — the shape of a restore, made foreignly.
+    func move(_ relativePath: String, toLane laneName: String, card cardName: String) throws {
+        try moveFolder(relativePath, to: "\(laneName)/\(cardName)")
+    }
 }
 
 // MARK: - Move/copy identities