Fix: Add pre_messages template for final_answer

prompts.yaml

@@ -188,6 +188,12 @@ prompt_templates:
       You have reached the final step of your task. Use the final_answer tool to submit your answer.
       The answer should be clear, concise, and directly address the original question.
       Format: final_answer(your_answer)
+    pre_messages: |-
+      You are about to submit your final answer. Make sure it is:
+      1. Clear and concise
+      2. Directly addresses the original question
+      3. Based on the information gathered
+      4. Uses the final_answer tool correctly
 
   planning:
     initial_facts: |-