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Bind the undo provider to the board, not the tier

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The 2026-07-31 re-ruling: gitless boards bind the native stack in every
tier — a Pro upgrade no longer removes undo from mode-none boards — and
Pro git boards bind the git provider; repo-nested stays the no-undo
case under Pro, while the free tier (which never runs detection) binds
native there too, per 12's inert posture. Add-git now swaps a live
native substrate mid-session: the in-flight stack is cleared with the
discarded provider, the git trail seeds from the root commit, and the
same BoardUndoManager instance keeps nil-target menu validation fresh.

2405 tests in 413 suites green.

Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97
This commit is contained in:
rzen
2026-07-31 18:53:38 -04:00
parent 3bd6187b94
commit 2e4dde5655
9 changed files with 286 additions and 104 deletions
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Kanban/History/HistoryProviding.swift
+8 -7
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@@ -80,9 +80,9 @@ public enum HistoryStepOutcome: Equatable, Sendable {
/// holds: move → move back ...; rename → restore title" — and both halves of that write are already
/// in the caller's hands: the before-value *is* the inverse, and the after-value is what the write
/// set (which is also what the staleness predicate compares). A step is therefore that pair, in the
/// design's own terms, and deliberately says nothing about how a stack stores it: the free tier's
/// stack is `NSUndoManager`-backed and Pro's is git (12-editions.md ▸ The provider seam), and neither
/// substrate appears here.
/// design's own terms, and deliberately says nothing about how a stack stores it: a gitless board's
/// stack is `NSUndoManager`-backed and a Pro git board's is git (12-editions.md ▸ The provider
/// seam), and neither substrate appears here.
///
/// ### `name` is the 06 vocabulary, unprefixed
///
@@ -143,10 +143,11 @@ public struct HistoryStep {
/// "One stack per board, owned by the board session. Not per-window: every window over a board
/// (board window, its card windows) shares the store and shares the stack" (13-native-undo.md
/// ▸ Rules). `AppModel.BoardSession` is where that ownership lives, and the composition root binds
/// which implementation it gets: the free tier binds `NativeHistoryProvider` (two step stacks over
/// the inverses registered at the Writer boundary), Pro binds the git provider in pro-m1 (undo as
/// forward restore commits over HEAD's first-parent ancestry — 06-history-undo.md), Teams inherits
/// Pro's.
/// which implementation it gets — **following the board, not the tier alone** (re-ruled 2026-07-31):
/// a gitless board binds `NativeHistoryProvider` (two step stacks over the inverses registered at
/// the Writer boundary) in every tier, a Pro git board binds the git provider (undo as forward
/// restore commits over HEAD's first-parent ancestry — 06-history-undo.md), a repo-nested board
/// binds none at all, and Teams inherits Pro's.
///
/// ### What this protocol deliberately does not say
///