fix final anwer object

prompts.yaml

@@ -319,10 +319,10 @@
   "report": |-
     Here is the final answer from your managed agent '{{name}}':
     {{final_answer}}
-final_answer: |-
-  ✅ Task complete!
-
-  🧠 Final Answer:
-  {{answer}}
-
-  Thank you for using the agent. If more assistance is needed, feel free to continue.
+final_answer:
+  pre_messages: |-
+    You're about to return the final answer to the task.
+    Please summarize your reasoning and state the final result.
+  post_messages: |-
+    This is the final output returned by the agent:
+    {{answer}}