test(iframe): [PKG-IFRAME-02] reproduce request and native window failures

refactor/tasks.json

@@ -3635,11 +3635,14 @@
         "ENG-03",
         "ENG-05"
       ],
-      "status": "todo",
+      "status": "done",
       "risk": "H",
       "deliverable": "跨窗口消息、ID 匹配、请求失败、重复 inject、销毁中请求",
       "acceptance": "旧版本行为可重跑，成功/失败/切源/销毁有必要断言",
-      "evidence": []
+      "evidence": [
+        "changes/2026-09-12-PKG-IFRAME-02-behavior.md",
+        "baselines/iframe-behavior-validation.json"
+      ]
     },
     {
       "id": "PKG-IFRAME-03",