When worktrees are nested under the main repo (e.g.,
/project/.worktrees/feature/), bd now correctly finds .beads/ in the
parent repo.
The fix simplifies GetMainRepoRoot() to use `git rev-parse --git-common-dir`
which always returns the main repo's .git directory, regardless of whether
we're in a regular repo, a worktree, or a nested worktree.
- Simplified GetMainRepoRoot() implementation
- Added tests for nested worktree scenarios
- Updated CHANGELOG.md
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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