test: harden remote control stress flow

tests/fixtures/computer-use-dialog-runtime.mjs

@@ -0,0 +1,24 @@
+let input = "";
+
+process.stdin.setEncoding("utf8");
+process.stdin.on("data", (chunk) => {
+  input += chunk;
+});
+
+process.stdin.on("end", () => {
+  const payload = JSON.parse(input || "{}");
+  process.stdout.write(
+    `${JSON.stringify({
+      status: "needs_user_action",
+      requestId: payload.requestId,
+      kind: "dialog_intervention_required",
+      dialogId: "dialog-system-permission",
+      appName: "System Settings",
+      platform: "darwin",
+      risk: "high",
+      summary: "System Settings 弹窗需要用户确认。",
+      recommendedAction: "handled_on_device",
+      availableActions: ["handled_on_device", "cancel_task"],
+    })}\n`,
+  );
+});