The tier axis comes out of the git stack — compose unconditional, postures mode-driven

HistoryStore.compose(boardRoot📒) returns non-optional and runs for
every session — the nil the gate produced was the only nil it ever had.
makeHistoryProvider is a one-axis decision: git-mode boards bind the git
provider, everything else native, in every tier; Session.tier stays
recorded, dormant. BoardGitSection shrinks to the four mode postures
(.absent and .proPointer die, BoardGitNote and the .git probe with them);
every board carries all three popover tabs (BoardInfoTab.available
retired); the titlebar branch shows on any git-mode board; the settings
sheet and card History section stop reading tier. InertGitTests is
repurposed as UntouchedGitTests — the file layer still never opens .git,
now load-bearing for mode-none boards. The accessibility audit reaches the
settings sheet at last: the fixture board hosts it in every tier, so the
free-fixture disabled-row test becomes an open-and-audit test.

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

Kanban/UI/Board/BoardInfoTabView.swift

@@ -57,8 +57,8 @@ struct BoardInfoMetrics: Equatable {
 /// gathered in one pass so the four numbers describe the same instant.
 ///
 /// **Taken once per appearance, never live.** The tab measures when it appears and shows that —
-/// the `hasGitDirectory` posture one section over: a read-only fact refreshed by reopening, not a
-/// live subscription. `FolderWatcher` deliberately filters `.git` churn out of the reload stream,
+/// a read-only fact refreshed by reopening, not a live subscription. `FolderWatcher` deliberately
+/// filters `.git` churn out of the reload stream,
 /// so there is no event these numbers could honestly hang off; and a size that ticked while the
 /// user watched would be motion without meaning on a settings surface.
 struct BoardDiskFootprint: Equatable, Sendable {