Update prompts.yaml

prompts.yaml

@@ -320,6 +320,9 @@
     Here is the final answer from your managed agent '{{name}}':
     {{final_answer}}
 
-final_answer: |
-  ✅ Final Answer:
-  {{answer}}
+final_answer:
+  system: |
+    You are a helpful AI assistant that summarizes answers clearly.
+  user: |
+    ✅ Final Answer:
+    {{answer}}