feat(git,session): add branch-selected worktree sessions

[lucas77778]

Summary

Implements Linear CODE-425 and its five child issues:

• add local-only git.branch.list, with the current branch first and remaining branches ordered by recent commit time
• resolve non-current branch selections into serialized, daemon-managed worktrees with durable ownership records and typed missing-worktree failures
• represent worktree workspaces explicitly and group their sessions under the parent project
• add a Git-gated branch picker to the new Thread flow, including remembered defaults, i18n, and desktop E2E coverage
• clean managed worktrees after durable session deletion only when branch/status/upstream/ahead checks prove removal safe; otherwise persist them as orphaned
• reconcile ownership and disk state at daemon startup, including conservative two-level orphan discovery

Wire protocol versions are bumped in lockstep from 52 to 55 across the three schema-changing commits.

Verification

• NODE_OPTIONS=--max-old-space-size=4096 devenv shell -- pnpm typecheck
• devenv shell -- pnpm test — 246 files / 1,945 tests passed; 1 file / 1 test skipped
• CODE-430 focused integration tests — 3 files / 28 tests passed
• devenv shell -- pnpm format:check — 1,154 files passed
• changed-file ESLint — no errors
• daemon and desktop production builds passed
• desktop new-session branch E2E passed under Xvfb with a real Git repository and isolated daemon

pnpm check:ci could not complete as a single command because whole-repository ESLint exhausts the available orb heap. Its format and typecheck stages pass, and ESLint passes for every changed TypeScript file.

Checklist

• pnpm check:ci and pnpm test both pass (full tests pass; whole-repo ESLint is blocked by the documented orb heap limit above)
• The affected surfaces were run and observed working
• Wire message changes bump WIRE_PROTOCOL_VERSION
• New code and assets are original work
• Relevant behavior comments and Linear implementation records are updated

[linear-code]

CODE-430

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[lucas77778]

Master sync and acceptance evidence

Merge commit 42a5cc3 synchronizes the branch with master at 765cbcd. GitHub reports the PR as MERGEABLE; all CI and CodeQL checks pass.

Conflict resolution

Resolved and integrated both sides in:

• apps/daemon/src/index.ts
• apps/desktop/package.json
• packages/client/workbench/src/surface/workbench.tsx
• packages/foundation/schema/src/wire/message.ts
• packages/presentation/ui/src/shell/new-session-surface.tsx
• packages/presentation/ui/src/shell/__tests__/new-session-surface.test.tsx

The merged result preserves master's channel-aware daemon state, simulator consent, browser tooling, controlled workspace catalogs, and Pi coverage while retaining CODE-425 worktree storage/injection and branch selection. Because the combined wire surface contains both master's changes and CODE-425 variants, the wire protocol moves from 62 to 63, including the desktop E2E fixture.

The real Electron E2E also sets LINKCODE_CHANNEL=development for its daemon so the unpackaged desktop and daemon discover the same isolated runtime.json after the channel-aware state change from master.

Verification

• Targeted CODE-425 suite: 70 passed
• Full Vitest suite: 2142 passed, 1 skipped (267 files passed, 1 skipped)
• Root TypeScript project build/typecheck: passed
• Biome format check: 1224 files, no changes required
• Changed TypeScript/TSX/MTS ESLint scope: 0 errors
• Daemon and desktop production builds: passed
• Real daemon + Electron + Git fixture E2E: PASS desktop new-session branch picker
• Full-repository ESLint could not complete locally in the orb because Node exhausted its heap even at 4 GiB; no lint failure was suppressed. The GitHub TypeScript job subsequently passed formatting, lint, typecheck, tests, and daemon process acceptance in its clean environment.

Acceptance video

Watch/download the 10.7-second acceptance recording (MP4, 1280×800, H.264)

The recording drives the real built Electron app against a real daemon and temporary Git repository: it adds the project, opens the branch picker, shows feature/code-428 with the isolated-worktree explanation, selects it, and verifies the context bar reflects the branch.

[AprilNEA]

squash migration files

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