[codex] Preserve PR materialization failure chains - #3443

Bugbot Analysis Progress (5m 0s elapsed)

✅ Gathered PR context (6s)
✅ Completed bug detection (4m 54s)
✅ Posted analysis results (0s)

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

Request ID: serverGenReqId_ed5b6429-5a8a-4b77-90a2-0229a938e95e