When debug mode is enabled, the merge system now logs a message when
an expired tombstone loses to a live issue (resurrection occurs).
This helps understand why previously closed issues reappear.
Example output: "Issue bd-abc resurrected (tombstone expired)"
Changes:
- Add debug parameter to Merge3WayWithTTL and merge3Way functions
- Add debug logging in all 4 resurrection code paths
- Update tests to pass new debug parameter (bd-nl2)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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