fix: revalidate review context and serialize index retry

backend/tests/test_chat_agent.py

@@ -175,6 +175,17 @@ def test_fixed_batch_membership_duplicate_queue_and_review(db, monkeypatch, sess
         "comment": "人工核定", "reason": "核查纸质材料"}, "给 3 分")
     action_id = prepared["pending_action"]["id"]
     assert score.teacher_score is None
+    student = db.get(Student, first.student_id)
+    student.name = "身份变化"
+    db.commit()
+    with pytest.raises(HTTPException):
+        confirm(db, conversation, action_id)
+    assert score.teacher_score is None
+    student.name = "学生4"
+    db.commit()
+    prepared = execute(db, conversation, "prepare_review", {"score_id": score.id, "score": 3,
+        "comment": "人工核定", "reason": "核查纸质材料"}, "给 3 分")
+    action_id = prepared["pending_action"]["id"]
     confirm(db, conversation, action_id)
     db.refresh(score)
     assert score.teacher_score == 3 and score.model_score is None and score.status == "reviewed"