Problem: Existing beads repositories initialized before commit a4c38d5 don't have sync.branch configured. This causes 'bd sync --status' to fail with a confusing error.
Solution: Added new check in 'bd doctor' that detects when sync.branch is not configured and provides automatic fix via 'bd doctor --fix'. The fix automatically sets sync.branch to the current branch using 'git symbolic-ref --short HEAD'.
Changes:
- Added checkSyncBranchConfig() function in doctor.go
- Created fix/sync_branch.go with SyncBranchConfig() fix handler
- Added comprehensive test coverage in doctor_test.go
- Integrated check into applyFixes() switch statement
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Co-Authored-By: Claude <noreply@anthropic.com>
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