diff --git a/app/services/conversation.py b/app/services/conversation.py
index a4c3cca..6daacad 100644
--- a/app/services/conversation.py
+++ b/app/services/conversation.py
@@ -276,7 +276,10 @@ class ConversationManager:
             profile.raw_info = raw
             self.db.add(profile)
             await self.db.commit()
-            logger.info("Contact completion note injected (conv=%s): %s",
+            # warning 级(2026-10-08 第四轮验收): 生产曾现 2/5 裸号轮墙未介入的
+            # 非确定性异常(同输入容器内链路复现正常)——本行生产可见,异常会话
+            # 可立刻分辨"计数/注入是否发生",供观察期定位
+            logger.warning("Contact completion note injected (conv=%s): %s",
                         conv.id, completion_marks)
 
         # Enrich short user messages with context so AI doesn't lose track