Update prompts.yaml

prompts.yaml

@@ -319,3 +319,10 @@
   "report": |-
     Here is the final answer from your managed agent '{{name}}':
     {{final_answer}}
+final_answer: |-
+  Use the `final_answer` tool to return your completed solution.  
+  Anything not wrapped in a `final_answer(...)` call will be discarded.  
+
+  Example syntax inside your code steps:
+
+      final_answer("Here is my answer: …")