perf(whisper): remove long-form decode overhead - #1

Bugbot Analysis Progress (1m 40s elapsed)

✅ Gathered PR context (2s)
✅ Completed bug detection (1m 38s)
✅ Posted analysis results (0s)

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

Request ID: serverGenReqId_1fe307bf-9d19-443d-a4a5-f0a0aa6b39a5