Add JSONL sanitization after git pull to remove deleted issues that
git's 3-way merge may resurrect. Also add bd doctor check to hydrate
deletions.jsonl from git history for pre-v0.25.0 deletions.
Changes:
- Add sanitizeJSONLWithDeletions() in sync.go (Step 3.6)
- Add checkDeletionsManifest() in doctor.go (Check 18)
- Add HydrateDeletionsManifest() fix in doctor/fix/deletions.go
- Add looksLikeIssueID() validation to prevent false positives
- Add comprehensive tests for sanitization logic
🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>
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