Realign code with the 2026-07-31 findings-resolution rulings

The full bullet list from Implementation card bf080d9a — both ruling
batches, including the three appended mid-session by 16ef377:

- Restore subjects compose the inverse, never nest: crossing "Undo: S"
  emits "Redo: S" and vice versa; parity, not stack depth, reads a
  legacy double prefix (GitHistoryProvider.restoreSubject).
- Git-operation failures join the one-shot failure banner tier:
  BannerCenter.GitFailureBanner (undo/redo/branchSwitch/addGit), error
  tone at failure rank merged with write one-shots by recency; the
  postLoss compromise is retired at both AppModel wirings.
- order/schema optional below the board root: append-at-end reading
  (ordered siblings first, folder-name tie-break among the order-less),
  schema reads 1, both coerce-tier logged; the root keeps its
  requirements. Ranks.resolvedOrders materializes finite ranks so
  models and placement math stay untouched; first Writer rewrite
  stamps a real rank on touch, placement against an order-less sibling
  stamps that sibling inline in the same bracket. Agent guide v10
  teaches optional keys and zero-read filing. Hostile-YAML order
  shapes become coercion tests; Fixtures/Valid/optional-keys.kanban
  replaces the four retired Malformed boards.
- .gitignore is the relocation-heal noise gate: GitignoreRules pure
  matcher (standard semantics, board-root file only), loader consults
  it once per walk so matched loose files keep the stray posture;
  seeded (.DS_Store + .*.lanework-*) at board creation and template
  instantiation, healed in when missing at open — repo-nested
  included; empty file honored, existing files never edited; the
  committer's obedience via libgit2 status is pinned by test.
- Comments crash-residue sweep gates on step ownership: HistoryStep
  derives backing from its own undo expectations, backedContent unions
  both stacks, the sweep purges per-entry only what no live step owns.
- Skip-purge decoupled (16ef377): a stale-skipped coarse step strands
  whole in NativeHistoryProvider.strandedSteps — still backing, retired
  only at session end; clean exits purge as before.
- Coarse close step named "Changes to '<card>'"; the fine body-edit
  wording never leaks onto the board menu.
- Branch-switch settle clears every open card window's fine stack on
  Save All and Discard alike; the empty fold registers no coarse step.
- Close flush awaits its covering snapshot (quiesce + one generation
  bump, 1s bound), and an explicit flush now queues behind an
  in-flight one instead of skipping — the audit-caught interleaving
  could lose a close flush permanently when the debounce fired inside
  the close sequence; regression tests force both races.
- Commit comment bullets sort chronologically by created, not UUID.
- The production-unwired CardBodyEditSession.editSessionDidChange seam
  is deleted with its seam-only tests.
- Composition-root pins: beginSession composes the committer with the
  store's own EchoLedger and binds the announcer (the miswire class).
- Deliberate 06 conformance pass over every 2026-07-31-tagged
  sentence: fixed Change-custom-key subjects (the retired named
  generic was the only producer), the unbuilt Replace attachment
  vocabulary, heal commits now authored Lanework Integrity, the config
  reader scopes identity to plain [user] sections, add-git re-runs
  detection at create (a stale mode-none could initialize inside the
  user's repo), and add-git failures answer at the form or the banner.
  Structural residue filed on the Redesign board.

2554 tests / 439 suites green.

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

Kanban/UI/Board/BoardGitControls.swift

@@ -235,8 +235,15 @@ struct BoardGitControls: View {
 // MARK: - Commit identity
 
 /// **The name and email that repo-local `.git/config` carries** (06-history-undo.md ▸ Interaction
-/// with external writers: "The board popover's git section exposes name/email fields that write that
-/// repo-local config — the setting *is* the file, portable to any git client, per-board by nature").
+/// with external writers: "The board settings sheet's identity section … exposes name/email fields
+/// that write that repo-local config — the setting *is* the file, portable to any git client,
+/// per-board by nature").
+///
+/// **Its home is the sheet, and the sheet is not built yet.** The 2026-07-31 popover/sheet split moved
+/// every setup-shaped control — add-git, branch creation, these fields, remote and credentials — out
+/// of the popover and into a board settings sheet (03-board-ui.md ▸ Board settings sheet), leaving the
+/// popover the daily face. This view is the fields, hosted where they were; the sheet's card moves
+/// them, along with the visibility-scoped poll below, which 06 says "rides with the fields".
 ///
 /// ### The placeholder is the whole of the identity rule made visible
 ///
@@ -270,8 +277,11 @@ private struct BoardGitIdentityFields: View {
         case email
     }
 
-    /// How often an open popover re-reads the config file. Slow enough to be free, fast enough that a
-    /// terminal `git config user.email …` shows up while the user is still looking at the popover.
+    /// **The fields re-read the config at 2 s while the surface is visible** (06 ▸ Interaction with
+    /// external writers, blessed 2026-07-31): "the watcher never delivers `.git`, so no board event
+    /// can carry a terminal-side config edit — the unfocused-resync courtesy needs its own signal, and
+    /// a visibility-scoped poll is the 15 s paused-state re-read's shape at sheet cadence (a focused
+    /// field keeps its keystrokes; dismissing the sheet stops the poll)."
     private static let pollInterval: Duration = .seconds(2)
 
     var body: some View {