Realign code with the 2026-07-31 rulings

The trash sorts by modified descending — the arrival rank mint retires
(Ranks.isOrderedForTrash one comparator, loader + merged order agree;
the legacy deleted: migration stamps modified from the tombstone
timestamp where parseable; delete undo steps validate existence-only;
agent guide v8). Trash selection goes kind-blind — ranges, marquee,
Select All, and the successor walk sweep both kinds; the guard moves to
the exits (mixed-payload drop refusal, copy/cut validation). The copy
stamping preflight widens back to comment depth (load-scoped posture —
the board always loads, the gesture refuses whole). Fixes a latent
no-op: trashed-lane drag restore never fired (DragSession.beginLanes
hard-coded the board container).

2403 tests in 413 suites green.

Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97

Kanban/UI/Board/CardFaceView.swift

@@ -356,12 +356,19 @@ struct CardFaceView: View {
     /// every other card drop uses, committed by the same `moveCards`.
     ///
     /// **Multi-drag carries the whole trash selection**, in the column's own order — the order the
-    /// rows are drawn in, which is `order` ascending like any lane's.
+    /// rows are drawn in, which since 2026-07-31 is `modified` descending (03 § Trash).
+    ///
+    /// **A kind-blind selection can span both kinds, and the session says so** (04-interactions.md ▸
+    /// The trash, ruled 2026-07-31): the lane rows in it cannot ride a `.cards` session, so rather
+    /// than let them fall silently out of the payload the flag travels and the *drop* refuses with
+    /// the notice (`DragSession.mixesKinds`). Pickup stays allowed — the selection is legal.
     private func startTrashCardDrag() -> NSItemProvider {
         guard !store.isReadOnly, !store.isEditingInline else { return NSItemProvider() }
         let ids = draggedIDs
         let rows = store.snapshot.trash.filter { ids.contains($0.id) }
         guard !rows.isEmpty else { return NSItemProvider() }
+        let mixesKinds = SelectionGrammar.mixesKinds(
+            ItemReferenceSet(ids: ids, container: .trash), in: store.snapshot)
 
         let root = store.rootURL
         let payload = DragPayload(
@@ -381,7 +388,8 @@ struct CardFaceView: View {
             folders: payload.folders,
             heights: rows.map { drops.registry.heights[$0.id] ?? LaneDropRegistry.nominalCardHeight },
             container: .trash,
-            source: store
+            source: store,
+            mixesKinds: mixesKinds
         )
         return payload.itemProvider()
     }