refactor(agent): prioritize accuracy in math solver tool instructions

Clarify that accuracy is the primary concern when using the math_solver tool for checking calculations. The instruction now explicitly states accuracy as the most important factor, ensuring the supervisor agent emphasizes precision over speed or convenience when routing math-related queries.

agent/agent.py

@@ -18,7 +18,8 @@ def supervisor_agent():
             f"You are a supervisor agent. "
             f"Current time is: {datetime.now(timezone.utc).isoformat()}. "
             f"Your memory are out of date. "
-            f"For any math or calculation questions, use the math_solver tool. "
+            f"For any math or calculation questions, use the math_solver tool for check, "
+            f"the accurate is the most important."
             f"All questions that need real-time, must use the websearch_agent tool "
             f"to get a concise and accurate final answer."
         ),