When using `bd create --id=<id>` where the ID matches an existing
tombstone (from `bd delete --hard --force`), the creation now succeeds
by first deleting the tombstone and all related records.
This enables use cases like polecat respawn where a worker needs to
recreate an issue with the same ID.
Changes:
- queries.go: Check for tombstone before insert, delete it if found
(cleans up events, labels, dependencies, comments, dirty_issues)
- tombstone_test.go: Add regression test
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Executed-By: beads/crew/dave
Rig: beads
Role: crew
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