Fixes from code review:
1. **Data completeness**: Now migrates events (including comments)
and all config values, not just issues/labels/deps
2. **formatJSONArray**: Fixed to use JSON encoding for waiters field
to match Dolt schema (was using comma-separated format)
3. **Cleanup on failure**: Removes partial Dolt directory or SQLite
files if import fails mid-way
4. **Progress indicator**: Shows "Importing issues: N/M" for large
migrations (100+ issues)
5. **Code deduplication**: Extracted common logic into:
- migrationData struct
- storageReader interface
- extractFromStore() shared extraction
- Helper functions for output formatting
6. **Improved dry-run output**: Now shows event count and config
key count in migration plan
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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