The sanitizeJSONLWithDeletions function was incorrectly removing ALL issues
whose ID appeared in deletions.jsonl, including tombstones. This caused:
1. Second sync after delete: tombstone removed from JSONL by sanitize
2. Import sees ID in deletions.jsonl but no tombstone in JSONL
3. Import creates new tombstone via convertDeletionToTombstone
4. UNIQUE constraint error: tombstone already exists in DB
The fix checks the issue status and only removes non-tombstone issues.
Tombstones are the proper representation of deletions and must be preserved.
Added test: TestSanitizeJSONLWithDeletions_PreservesTombstones
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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