- bd-ki14: Preserve tombstones when other side implicitly deleted
In merge3WayWithTTL(), implicit deletion cases now check if the
remaining side is a tombstone and preserve it instead of dropping.
- bd-ig5: Remove duplicate constants from merge package
StatusTombstone, DefaultTombstoneTTL, and ClockSkewGrace now
reference the types package to avoid duplication.
- bd-6x5: Handle empty DeletedAt in mergeTombstones()
Added explicit handling for edge cases where one or both tombstones
have empty DeletedAt fields with deterministic behavior.
- bd-1sn: Copy tombstone fields in mergeIssue() safety fallback
When status becomes tombstone via mergeStatus safety fallback,
tombstone fields are now copied from the appropriate side.
Added comprehensive tests for all fixed edge cases.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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