• Fills a gap pointed out post-v0.3: docs had file-mtime + history/ archival
    only, no real version control. Now every Agent that completes work triggers
    LoopController to git commit; project ship/sign-off/abandon tag the repo.
    
    Design:
    - One git repo per project at data/companies/{cid}/projects/{pid}/.git
    - LoopController-centralized commits (Agents stay sandboxed, no git access)
    - Commit cadence: each Agent success → commit; Tester red → no commit;
      shipped/sign-off/abandon → tag
    - New GitVault service (C-18): spawn-git wrapper, ~150 lines,
      init/commit/tag/log/diff/status/archive/revert/resetWorkingTree
    - New process P-10 (Process.GitCommit): commitAfterAgent hook in
      callAgentWithPersistence; recoverOnBoot extended to detect dirty trees
    - .gitignore excludes agent-state/ (high-write) + history/ (git is history)
      + stream.log + runs stdout (too large)
    - New SSE events: git.committed · git.tagged · recovery_dirty_tree
    - Defer git push-to-remote to v2 (no network deps in v1)
    
    Pages changed:
    - arch-git-versioning.html (NEW, comprehensive design, 16 sections)
    - sdd-control.html       (+C-18 GitVault spec)
    - sdd-process.html       (+P-10 commitAfterAgent + recoverOnBoot dirty-check)
    - data-layout.html       (.git/ + .gitignore in project tree)
    - plan-migration.html    (P0 +3 days for GitVault, total 10 weeks)
    - assets/shell.js        (sidebar adds arch-git-versioning)
    - assets/search-index.json (rebuilt, 189.5KB, 50 pages)
    - build-manifest.json    (52 → 54 defs, 100% extraction)
    
    Key benefit: Coder 3-retry chain can be `git diff`-ed; L2 fail allows clean
    revert; project export becomes `git archive HEAD` (tracked files only,
    not the ~30MB project dir).
    
    Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
    yibo authored
     
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