Remove duplicate completion logs

- Management loop silently completes cancelled jobs
- Eliminates duplicate completion messages
- Cleaner logging with only cancel_job messages

vidai/cluster_master.py

@@ -1411,7 +1411,6 @@ class ClusterMaster:
                 for job_id in cancelled_jobs:
                     if job_id in self.active_jobs:
                         self.complete_job(job_id)
-                        print(f"Completed cancelled job {job_id}")
 
                 await asyncio.sleep(5)  # Poll every 5 seconds