Prevent duplicate completion logs

- Only complete and log cancelled jobs that are still active
- Prevents duplicate completion messages for jobs already handled
- Cleaner logging for job cancellation

vidai/cluster_master.py

@@ -1409,8 +1409,9 @@ class ClusterMaster:
                         cancelled_jobs.append(job_id)
 
                 for job_id in cancelled_jobs:
-                    self.complete_job(job_id)
-                    print(f"Completed cancelled job {job_id}")
+                    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