- Add performMerge() with dependency migration in both directions
- Implement updateMergeTextReferences() for text reference updates
- Close source issues with 'Merged into bd-X' reason
- Fix store initialization panic by checking daemon mode earlier
- Add TODO for transaction support (deferred, see bd-215 for idempotency approach)
Closes bd-202, bd-193, bd-194, bd-195, bd-196
Related: bd-190 (merge epic), bd-215 (idempotency enhancement)
Amp-Thread-ID: https://ampcode.com/threads/T-30fe297d-4713-4f84-abc9-3bd264caa4c6
Co-authored-by: Amp <amp@ampcode.com>
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