§14 长任务与持久执行：Fiber 断点续跑

class MyAgent extends Agent {
  async doWork() {
    await this.runFiber("my-task", async (ctx) => {
      const step1 = await expensiveOperation();
      ctx.stash({ step1 });                 // 检查点
      const step2 = await anotherOp(step1);
      this.setState({ ...this.state, result: step2 });
    });
  }

  async onFiberRecovered(ctx) {
    if (ctx.name !== "my-task") return;
    const snap = ctx.snapshot as { step1: unknown } | null;
    if (snap) {
      const step2 = await anotherOp(snap.step1); // 从检查点续
      this.setState({ ...this.state, result: step2 });
    }
  }
}

// 长效任务：启动-休眠-回调 模式
await this.runFiber("research", async (ctx) => {
  const steps = ["search", "analyze", "synthesize"];
  const completed: string[] = [];
  for (const step of steps) {
    await executeStep(step);
    completed.push(step);
    ctx.stash({ completed }); // 每步存盘
  }
});