Fix JSON response parsing in ux_testing_fsm function to directly access the response object.

core.py

@@ -415,7 +415,7 @@ def ux_testing_fsm(persona: dict, task: str, image: str, available_actions: list
         )
         
         # Parse JSON response
-        parsed_response = json.loads(response)["ux_testing_response"]
+        parsed_response = json.loads(response)
         
         # Validate action is in available actions
         if parsed_response.get("action_taken") not in available_actions: