fixed submit answers

agentcourse_unit4/api/agent_eval_api.py

@@ -38,7 +38,7 @@ class AgentEvalApi:
         request_body = {
             "username": username.strip(),
             "agent_code": agent_code,
-            "answers": [{"task_id": a.task_id, "submitted_answer": str(a.answer)} for a in answers]
+            "answers": [{"task_id": a.task_id, "submitted_answer": a.answer} for a in answers]
         }
         response = requests.post(self.submit_url, json=request_body, timeout=60)
         response.raise_for_status()