refactor: unify user chain data port access

tests/test_architecture_dependencies.py

@@ -428,6 +428,30 @@ def test_workflow_domain_uses_explicit_chain_data_port_getters():
     assert violations == []
 
 
+def test_user_and_messaging_chains_use_explicit_data_port_getters():
+    """用户、交互和消息链不得把迁移期 UserPortProxy 伪装成 UserOper。"""
+    paths = [
+        APP_ROOT / "chain" / "user.py",
+        APP_ROOT / "chain" / "interaction.py",
+        APP_ROOT / "chain" / "_messaging.py",
+    ]
+    violations: list[str] = []
+    for path in paths:
+        tree = ast.parse(path.read_text(encoding="utf-8-sig"), filename=str(path))
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.ImportFrom):
+                continue
+            if node.module != "app.application.chain.data":
+                continue
+            for alias in node.names:
+                if alias.name == "UserPortProxy":
+                    violations.append(
+                        f"{path.relative_to(PROJECT_ROOT).as_posix()}:{node.lineno}"
+                    )
+
+    assert violations == []
+
+
 def test_plugin_components_do_not_reexport_legacy_abi_names():
     """新插件组件只提供 canonical 能力，不得复制旧 Helper、Manager 或 Oper 导出。"""
     violations: list[str] = []