Adds tests for the daemon-side RPC delete handler (bd-dxtc):
- Dry-run mode returns preview without actual deletion
- Invalid issue IDs return appropriate errors
- Partial success when some IDs valid, some invalid
- No IDs provided error case
- Invalid JSON args handling
- Response structure validation (deleted_count, total_count)
- Storage not available error
- Tombstone creation with SQLite storage
- All failures error handling
- Dry-run preserves data across multiple runs
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>