从一次请求，
到稳定集成.

// Illustrative server-side TypeScript; adapt to the agreed contract.
async function waitForTask(taskId: string, signal: AbortSignal) {
  const baseUrl = process.env.IDENIFE_BASE_URL;
  const key = process.env.IDENIFE_API_KEY;
  if (!baseUrl || !key) throw new Error("Missing configuration");

  for (let attempt = 0; attempt < 20; attempt++) {
    signal.throwIfAborted();
    const response = await fetch(
      baseUrl + "/v1/tasks/" + encodeURIComponent(taskId),
      { headers: { Authorization: "Bearer " + key }, signal }
    );
    if (!response.ok) throw new Error("HTTP " + response.status);
    const task = await response.json();
    if (task.status === "succeeded") return task.result;
    if (["failed", "cancelled"].includes(task.status)) {
      throw new Error(task.error?.code ?? task.status);
    }
    await new Promise<void>((resolve, reject) => {
      const stop = () => {
        clearTimeout(timer);
        reject(signal.reason);
      };
      const timer = setTimeout(() => {
        signal.removeEventListener("abort", stop);
        resolve();
      }, 1500);
      signal.addEventListener("abort", stop, { once: true });
    });
  }
  throw new Error("Polling budget exceeded; preserve taskId");
}