The seams unbind — the provider is always native, and the git stack compiles dead

Step 4 of strategy/01-git-excision.md, the entangled one: AppModel's makeHistoryProvider collapses to the native provider (the seam stays injectable per the reversibility posture), the session's git state and its wiring go (wireGitUndo, wireBranchSwitching, the card-session staging threading), BoardStore sheds commitSeam and the identity-history ranker (the loader's nil-safe rung now tops out at birth date — today's no-git behavior), SessionSettleGate keeps the gate and inherits the path utility it borrowed, BoardRegistry drops the persisted operation stamp (decode-safe), and the git banner family leaves BannerCenter with its announcer and accessibility phrases. One missed harvest tie severed (the narrator's root subject is its own now). Nothing outside Kanban/Git/ references the stack — proven by sweep. 2,855 tests green.

Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy

Kanban/Changes/ChangeNarrator.swift

@@ -24,10 +24,10 @@ import Foundation
 /// ### Purity, and where the impurity went
 ///
 /// Nothing in here reads a file, opens a repository, or asks what time it is. Both snapshots and the
-/// guide's text arrive as values on `ChangeNarrationRequest`; `GitAutoCommitter` resolves them once per
-/// flush, the last-committed one through `GitHeadSnapshot`. That is what makes the whole vocabulary —
-/// every subject form, every fold, every trash reading — testable with two snapshots and no
-/// repository at all.
+/// guide's text arrive as values on `ChangeNarrationRequest`, resolved once per window by whoever is
+/// driving the narration — the previous snapshot included. That is what makes the whole vocabulary —
+/// every subject form, every fold, every trash reading — testable with two snapshots and no store at
+/// all.
 ///
 /// ### The changed-path list is a filter, not a hint
 ///
@@ -93,6 +93,14 @@ enum ChangeNarrator {
     /// says *added* without a second sentence shape for it.
     static let absentValuePlaceholder = "(none)"
 
+    /// **The subject the one snapshot-less window gets** (06 ▸ Rules ▸ Abnormal repo states): a first
+    /// window with no previous snapshot to diff against describes the whole board as arriving, never a
+    /// folded diff-from-empty.
+    ///
+    /// Defined here rather than borrowed from a substrate, so the narrator stays a pure function of
+    /// two snapshots (`strategy/01-git-excision.md` ▸ What is harvested).
+    static let rootSubject = "Initial board state"
+
     // MARK: - Entry point
 
     /// One request in, one whole message out — a subject, and a body when there is more to say.
@@ -100,7 +108,7 @@ enum ChangeNarrator {
         // **The one commit with a subject of its own** (06 ▸ Rules ▸ Abnormal repo states): "it
         // commits the whole tree as *Initial board state*, never a folded diff-from-empty: there is
         // no last-committed snapshot to diff against."
-        guard !request.isRootCommit else { return GitRepository.initialCommitSubject }
+        guard !request.isRootCommit else { return rootSubject }
         return assemble(events(for: request), request: request)
     }
 
@@ -910,7 +918,7 @@ enum ChangeNarrator {
     /// inside a thread at all.
     ///
     /// Shared with the flush that reads each of those folders' `created`
-    /// (`GitAutoCommitter.commentTimestamps(for:boardRoot:)`), so the key a timestamp is *filed*
+    /// (`ChangeNarrationRequest.commentTimestamps`), so the key a timestamp is *filed*
     /// under and the key it is *looked up* by have one definition. Everything about where a thread
     /// lives is still `CommentPath.classify`'s; this only says how many of the path's components that
     /// classification consumed.
@@ -1281,9 +1289,9 @@ enum ChangeNarrator {
         /// Whether a path could make the *snapshot* differ at all — every path the model speaks for,
         /// plus attachments, whose names it carries.
         ///
-        /// The flush asks it before it materializes HEAD's tree: a window of nothing but strays and
-        /// the agent guide composes path-shaped events, and reading two whole boards to describe a
-        /// changed `.gitignore` would be work with no reader (`GitAutoCommitter.composition`).
+        /// The flush asks it before it materializes the previous snapshot: a window of nothing but
+        /// strays and the agent guide composes path-shaped events, and reading two whole boards to
+        /// describe a changed `.gitignore` would be work with no reader.
         static func mightAffectSnapshot(_ path: String) -> Bool {
             isModelSilent(path) || path.split(separator: "/").contains(Substring(attachmentsFolder))
         }