Tom Boucher 0afffb15f5 feat(core): worktree-aware .planning/ resolution and file locking (#1215) ...

- Add resolveWorktreeRoot() that detects linked worktrees via
  git rev-parse --git-common-dir and resolves to the main worktree
  where .planning/ lives
- Add withPlanningLock() file-based locking mechanism to prevent
  concurrent worktrees from corrupting shared planning files
- Wire worktree root resolution into gsd-tools.cjs main entry point
- Add regression tests for resolveWorktreeRoot (non-git, normal repo)
  and withPlanningLock (normal execution, error cleanup, stale lock
  recovery)

2026-03-19 13:41:11 -04:00

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