docs: 上游吸收审查修补（注释纠偏/上游标点恢复/交叉引用闭合）

- test_lead_push_cc: 两处"双钉"注释与模块头改为如实的跨文件互补分工
  (常量同源钉本文件,字节级措辞钉 test_lead_push_service.py /
  test_email_rendering.py)
- chat_rest: _server_ip/_merge_client_info docstring 与调用点注释恢复
  上游半角标点原文(逐字同步,便于将来 diff 式跟上游)
- chat.py WS 自报注释补 REST 侧交叉引用,闭合悬空不对称说明

全量回归 459 passed(不变)

Co-Authored-By: Claude Code <noreply@anthropic.com>

tests/test_lead_push_cc.py

@@ -6,7 +6,8 @@ monkeypatch settings.PUSH_ENABLED → dispatch_lead_push → 查 request_payload
 断言按 jc(Task 6)主线重锚,语义等价:
 - 派生键名: 上游 "区号未确认" → jc "号码补全说明"(号码补全的推送披露口);
 - 条目措辞: 上游 "渠道(标注)" → jc completion_note 的 "原文→e164+标注"
-  (标注常量与 cc_completion 同源,双钉防漂移);
+  (标注常量与 cc_completion 同源;字节级措辞钉在 test_lead_push_service.py /
+  test_email_rendering.py,跨文件互补);
 - NOTE_CUSTOMER 已在 jc 并入 NOTE_UNCONFIRMED(customer_stated 未确认与
   IP 推测同口径标注,上游的措辞区分被主线统一);
 - confirmed 入参传裸号原文(jc 生产契约: dispatch 收 normalize_contacts
@@ -73,7 +74,8 @@ def test_push_payload_uses_e164_and_filters_underscore(async_db, monkeypatch):
     p = log.request_payload
     assert p["contact"]["whatsapp"] == "+254712345678"   # 契约值=e164(Task6投影)
     assert not [k for k in p["profile"] if str(k).startswith("_")]  # _cc/_secret不外泄
-    # 双钉: 与常量同源 + 字节级措辞(改常量必须联动,措辞本身不得漂移)
+    # 常量同源钉在本文件,字节级措辞钉在 test_lead_push_service.py /
+    # test_email_rendering.py(跨文件互补)
     assert p["profile"]["号码补全说明"] == f"0712345678→+254712345678{NOTE_UNCONFIRMED}"
 
 
@@ -118,7 +120,8 @@ def test_push_payload_customer_stated_note(async_db, monkeypatch):
                                              e164="+256712345678")}})
     log = _dispatch(async_db, {"whatsapp": "0712345678"})
     p = log.request_payload
-    # 双钉: 与常量同源 + 字节级措辞(改常量必须联动,措辞本身不得漂移)
+    # 常量同源钉在本文件,字节级措辞钉在 test_lead_push_service.py /
+    # test_email_rendering.py(跨文件互补)
     assert p["profile"]["号码补全说明"] == f"0712345678→+256712345678{NOTE_UNCONFIRMED}"
     assert p["contact"]["whatsapp"] == "+256712345678"