feat(git): VS Code-style branch sync control

[TheIcarusWings]

What

Adds a VS Code-style ahead/behind sync control next to the branch in the composer toolbar, plus the standalone git RPCs behind it. Previously there was no visible ahead/behind indicator, no standalone fetch, and no one-click sync — push only existed bundled inside the stacked action.

The control is state-driven:

State	Shows	Action
Up to date	✓ + Fetch	Fetch
Ahead	↑N	Push
Behind	↓N	Pull (--ff-only)
Diverged	⟳ ↓N ↑M	Sync → clear "diverged" toast + Rebase & sync
No upstream	Publish	Push + set upstream

A standalone Fetch button is always present to force-refresh the counts (the server already auto-fetches on a 30s poller; this just bypasses the wait).

How

• contracts: vcs.fetch / vcs.push / vcs.sync RPCs + a typed GitDivergedError.
• server: GitVcsDriverCore.fetchCurrentBranch + syncCurrentBranch (fast-forward pull / push / publish chosen by ahead-behind; diverged history → GitDivergedError unless mode:"rebase", which runs git pull --rebase and aborts cleanly on conflict so the tree is never left mid-rebase). The standalone push reuses the exact driver call the stacked action uses, so upstream + push-remote resolution (fork-aware) stays shared. Never force-pushes.
• client: wsRpcClient vcs.{fetch,push,sync}, action-manager operations, and useVcs{Fetch,Push,Sync}Action hooks.
• web: new GitSyncControl wired into the branch toolbar (reuses the existing status subscription — no extra WS traffic).

Hardening

Extracts RPC_REQUIRED_SCOPE into its own module with a completeness test asserting every WsRpcGroup method declares an auth scope — this gate was previously runtime-only (a missing scope threw on a live call, not in CI).

Tests

• Real-git integration tests for ahead→push, behind→ff-pull, diverged→typed error (clean tree), rebase→push, publish→set-upstream, and fetch.
• Updated the affected client/web RPC mocks.
• All 5 UI states manually verified end-to-end in the running app against a scratch repo + bare remote + teammate clone (linear history confirmed after rebase; branch + upstream confirmed after publish).

🤖 Generated with Claude Code

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Note

Medium Risk
New git fetch/push/sync and rebase-on-sync mutate remotes and working trees; scope is bounded by existing orchestration operate auth and no force-push, but diverged-history handling is user-visible and operationally sensitive.

Overview
Adds a VS Code-style sync UI beside the branch picker: ahead/behind badges, one-click publish/pull/push/sync, a always-on Fetch control, and a diverged-branch toast with Rebase & sync. The branch combobox is disabled while fetch/push/pull/sync (or stacked git actions) run on the same cwd.

Backend: New vcs.fetch, vcs.push, and vcs.sync RPCs with contract types and GitDivergedError. GitVcsDriverCore implements fetchCurrentBranch and syncCurrentBranch (fetch, ff-pull, push/publish, optional rebase with abort-on-conflict); GitWorkflowService exposes fetch/push/sync to WS handlers, with standalone push mapped from the same driver path as stacked actions.

Client: wsRpcClient, VCS action manager, and hooks for fetch/push/sync; RPC_REQUIRED_SCOPE moved to rpcRequiredScope.ts with tests that every served RPC has a scope (including the three new operate-scoped methods).

Tests: Real-git coverage for sync paths; mocks updated for new VCS RPCs.

^{Reviewed by Cursor Bugbot for commit 3ef1547. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add VS Code-style branch sync controls with fetch, push, and sync RPCs

• Adds a GitSyncControl toolbar component that displays ahead/behind/publish state and exposes fetch, pull, push, and sync actions similar to VS Code's branch sync UI.
• Implements fetchCurrentBranch, pushCurrentBranch, and syncCurrentBranch in the VCS driver and service layers; sync performs fetch + fast-forward pull/push, publishes new branches, and optionally rebases on divergence.
• Adds vcs.fetch, vcs.push, and vcs.sync WebSocket RPCs with type-safe schemas including a GitDivergedError for diverged branches in fast-forward mode.
• The branch selector in BranchToolbarBranchSelector is disabled while a sync action is running to prevent conflicting operations.
• Risk: diverged branches in default (fast-forward) mode now surface a GitDivergedError rather than silently failing; rebase must be explicitly requested.

^{Macroscope summarized 3ef1547.}

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[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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^{Reviewed by Cursor Bugbot for commit c365aaa. Configure here.}

[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new feature with new UI components (GitSyncControl), new RPC endpoints (fetch/push/sync), and new git operations including rebase handling for diverged branches. New user-facing features with this scope warrant human review.

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[juliusmarminge]

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