Fix cache salt forwarding in train client - #2463

Bugbot Analysis Progress (3m 7s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (3m 5s)
✅ Posted analysis results (1s)

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

Request ID: serverGenReqId_b83d7b2a-988f-4d25-a484-7ad9beb22f61