Implement undo and redo as forward commits
GitHistoryProvider is the second HistoryProviding implementation: its stack IS HEAD's first-parent ancestry, reseeded on load (redo empty), re-synced to HEAD before every crossing so agents' self-commits become the top and ⌘Z steps back exactly one commit; any arriving commit clears redo (a heal-only window deliberately does not). Restores are forward commits through the ordinary signature path — GitRestoreOperation materializes only the current-vs-target diff as working-tree writes and resolves no reset/checkout symbol at all; heal commits are transparent in-session (pointer passes over, restores exclude heal-owned paths, identity carried on landed windows via PlannedCommit.kind → GitLandedCommit). Subjects "Undo:/Redo: <crossed subject>"; menu labels never nest in-session; the root commit is not a step (crossing it would restore the empty tree). Provider binding flips: makeHistoryProvider(store, tier, git) — free binds native everywhere, Pro binds the git provider on git boards and NOTHING on mode-none/repo-nested (the pair disables through existing validation); add-git mid-session live-binds via HistoryStore.didAddGit → bindHistoryProvider (the flip only ever adds). SessionSettleGate is the reusable Save All / Discard / Cancel step: restores whose diff touches an open Edit session or raw-source buffer gate on it (Save All applies with validation — a refused buffer cancels the whole restore focused on the offender; Discard reverts via CardBodyEditSession.discardBuffer and reconciles against the working tree, deliberately skipping the second flush); untouched sessions ride through undisturbed. Built for the branch-switch card to reuse. BoardStore gains the async performWholesale sibling. CardHistorySection fills the m6 EmptyView slot: read-only, newest first, follows the card across lane moves by folder-component match (the UUID is the identity — no rename detection), absent off git mode and off Pro. 2332 tests / 403 suites green; InertGitTests untouched. Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY
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