feat: archive mvp demo trace acceptance

src/main/java/com/superbiz/agent/service/ChatService.java

@@ -416,6 +416,9 @@ public class ChatService {
                 answer = extractStateText(stateOptional, "executor_feedback");
                 VerifierContextHolder.setExecutorFinalAnswer(answer);
                 String verifierOutput = extractStateText(stateOptional, "verifier_output");
+                if ((verifierOutput == null || verifierOutput.isBlank()) && answer != null && !answer.isBlank()) {
+                    verifierOutput = invokeVerifierFallback(verifier, question, round, config);
+                }
                 finalDecision = parseVerifierDecision(verifierOutput, round);
                 logger.debug("Supervisor round {} finished: plannerPlanLength={}, answerLength={}, verifierOutputLength={}",
                         round,
@@ -588,6 +591,17 @@ public class ChatService {
         return input.toString();
     }
 
+    private String invokeVerifierFallback(ReactAgent verifier, String question, int round, RunnableConfig config) {
+        try {
+            logger.warn("Supervisor round {} finished without verifier_output, invoking chat_verifier fallback", round);
+            return verifier.call("请基于 executor_final_answer 和 tool_trace_summary 输出 verifier JSON。原始问题：" + question, config)
+                    .getText();
+        } catch (Exception e) {
+            logger.error("chat_verifier fallback 执行失败", e);
+            return null;
+        }
+    }
+
     private VerifierDecision parseVerifierDecision(String verifierOutput, int round) {
         if (verifierOutput == null || verifierOutput.isBlank()) {
             return null;