* fix(syncbranch): support bare repos and worktrees with git-common-dir
Replace hardcoded .git/beads-worktrees/ path with dynamic detection using
git rev-parse --git-common-dir. This correctly handles:
- Regular repositories (.git is a directory)
- Git worktrees (.git is a file pointing elsewhere)
- Bare repositories (no .git directory, repo IS the git dir)
- Worktrees of bare repositories
The new getBeadsWorktreePath() helper uses git's native API to find the
shared git directory, ensuring beads worktrees are created in the correct
location regardless of repository structure.
Updated functions:
- CommitToSyncBranch
- PullFromSyncBranch
- CheckDivergence
- ResetToRemote
Fixes#639
* test(syncbranch): add regression tests for getBeadsWorktreePath
Add comprehensive tests for the worktree path calculation to ensure proper
handling of various repository structures:
- Regular repos: uses .git/beads-worktrees path
- Bare repos: uses <bare-repo>/beads-worktrees (no .git subdirectory)
- Worktrees: uses main repo's .git/beads-worktrees (git-common-dir)
- Fallback: legacy behavior when git command fails
- Relative paths: ensures absolute path conversion
These tests ensure the fix for GH#639 doesn't regress.
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Co-authored-by: Charles P. Cross <cpdata@users.noreply.github.com>
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