fix(preflight): resolve labels.csv filename by column name, not position - #207

Bugbot Analysis Progress (1m 1s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (58s)
✅ Posted analysis results (1s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_6702f156-57be-4a38-9469-9fb115399880