Add two new doctor checks for tombstone health:
1. Updated Deletions Manifest check:
- Warns when legacy deletions.jsonl has entries (suggests migration)
- Shows "Migrated to tombstones" when .migrated file exists
- Shows "Using inline tombstones" for new repos
2. New Tombstones check:
- Reports total tombstone count
- Warns about expired tombstones (older than 30 days)
- Shows tombstones expiring within 7 days
- Suggests 'bd compact' to prune expired tombstones
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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