fix(proxy): strip client fetch metadata upstream

scripts/run-pi-subagent-packaged-smoke.mjs

@@ -20,6 +20,7 @@ function parseArgs(argv, projectRoot = process.cwd()) {
   };
   for (let index = 0; index < argv.length; index += 1) {
     const argument = argv[index];
+    if (argument === '--') continue;
     const value = argv[index + 1];
     if (!value || value.startsWith('--')) throw new Error(`${argument} requires a value`);
     if (argument === '--runtime-root') options.runtimeRoot = resolve(value);
@@ -306,11 +307,15 @@ export async function runPackagedProductProof(options) {
       || beforeSubmitText.includes('正在重新连接本地 Agent')) {
       throw new Error(`Packaged proxy first Conversation exposed a runtime banner: ${beforeSubmitText}`);
     }
-    await page.getByTestId('coding-message-composer').evaluate(
-      (form) => form.requestSubmit(),
-    );
+    await page.getByRole('button', { name: '发送' }).click({ timeout: 30_000 });
 
-    const proxyStatus = await waitForActiveProxyProof(electronApplication);
+    let proxyStatus;
+    try {
+      proxyStatus = await waitForActiveProxyProof(electronApplication);
+    } catch (error) {
+      const bodyText = await page.locator('body').innerText().catch(() => '<unavailable>');
+      throw new Error(`${error instanceof Error ? error.message : String(error)}; UI=${bodyText}`);
+    }
     assertPackagedMain(proxyStatus);
     assertProxyStatus(proxyStatus.proxy);
     await evaluateProof(electronApplication, 'proxy.release-child');