Speed up train completion usage serialization - #1787

Bugbot Analysis Progress (51s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (48s)
✅ Posted analysis results (0s)

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

Request ID: serverGenReqId_1ba83d18-c5b6-41c3-a9ae-fdb4ffbcbd83