New web interface, move llm engine to separate process

sia/working_memory.py

@@ -85,8 +85,8 @@ class WorkingMemory:
         
     def __del__(self):
         """Clean up all entries when memory is deleted."""
-        if hasattr(self, '_entries'):
-            self.clear()
+        self._change_handlers.clear()
+        self.clear()
             
     def get_entry(self, id: str) -> Optional[Entry]:
         """