收紧 H5 剪贴板写入载荷

在 H5 HostBridge facade 发起剪贴板写入前按共享上限归一化文本

增加 HostBridge 写剪贴板载荷截断测试和总门禁反查

同步宿主壳协议文档和共享决策记录

scripts/check-native-shells.mjs

@@ -1028,6 +1028,18 @@ function assertH5HostBridgePayloadBoundaries() {
       'H5 HostBridge facade must use shared HOST_BRIDGE_SCANNER_TIMEOUT_MS',
     );
   }
+  if (
+    !h5HostBridgeSource.includes(
+      'const clipboardText = normalizeHostBridgeClipboardText(text);',
+    ) ||
+    !h5HostBridgeSource.includes(
+      "return await requestNativeHostBoolean('clipboard.writeText', clipboardText);",
+    )
+  ) {
+    throw new Error(
+      'H5 HostBridge facade must normalize clipboard.writeText payloads with the shared clipboard boundary',
+    );
+  }
 }
 
 function assertH5NativeAppTransportTimeoutBoundaries() {