Fix halt message queue clearing issue

When a halt command is received, the bot now properly deletes the queue file
before terminating. This prevents the halt message from being reprocessed
when the bot restarts, which could cause an infinite halt loop.

Changes:
- Added queue_filepath parameter to process_mention()
- Delete queue file and mark notification as processed before exit(0)
- Updated all process_mention() calls to pass the filepath

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[e-mail]>

bsky.py

···
     return void_agent
 
 
-def process_mention(void_agent, atproto_client, notification_data):
+def process_mention(void_agent, atproto_client, notification_data, queue_filepath=None):
     """Process a mention and generate a reply using the Letta agent.
+    
+    Args:
+        void_agent: The Letta agent instance
+        atproto_client: The AT Protocol client
+        notification_data: The notification data dictionary
+        queue_filepath: Optional Path object to the queue file (for cleanup on halt)
     
     Returns:
         True: Successfully processed, remove from queue
···
                     except:
                         logger.info("Halt reason: <unable to parse>")
                     
+                    # Delete the queue file before terminating
+                    if queue_filepath and queue_filepath.exists():
+                        queue_filepath.unlink()
+                        logger.info(f"✅ Deleted queue file: {queue_filepath.name}")
+                        
+                        # Also mark as processed to avoid reprocessing
+                        processed_uris = load_processed_notifications()
+                        processed_uris.add(notification_data.get('uri', ''))
+                        save_processed_notifications(processed_uris)
+                    
                     # Export agent state before terminating
                     export_agent_state(CLIENT, void_agent)
                     
···
                 # Process based on type using dict data directly
                 success = False
                 if notif_data['reason'] == "mention":
-                    success = process_mention(void_agent, atproto_client, notif_data)
+                    success = process_mention(void_agent, atproto_client, notif_data, queue_filepath=filepath)
                     if success:
                         message_counters['mentions'] += 1
                 elif notif_data['reason'] == "reply":
-                    success = process_mention(void_agent, atproto_client, notif_data)
+                    success = process_mention(void_agent, atproto_client, notif_data, queue_filepath=filepath)
                     if success:
                         message_counters['replies'] += 1
                 elif notif_data['reason'] == "follow":