Adds automatic database recovery when bd doctor --fix detects corruption:
- Detects SQLite corruption (malformed database, SQLITE_CORRUPT errors)
- Backs up corrupted database before recovery attempt
- Rebuilds from JSONL if available (issues.jsonl, deletions.jsonl)
- Falls back to fresh database if JSONL unavailable
- Reports recovery results (issues imported, success/failure)
Recovery is triggered automatically by --fix when corruption is detected.
No manual intervention required.
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