Codex 下 Orca Worker 回传结果报 cancelled-before-dispatch，需手动重试才能送达

**提交人**: 散修院院长
**客户端版本**: 0.1.30

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## 现象

使用 Codex 时，主 Agent 派出 Orca Worker（subagent）执行任务。Worker 完成任务并上报结果后，结果进入对话等待列表；但主 Agent 执行完当前任务后，首次接收上报会报错：

```
cancelled-before-dispatch: Session send was cancelled before vendor dispatch: SEND/83521c7e-824b-4db3-bffb-e1103ec0d97a/send
```

## 复现步骤

1. 主 Agent 通过 Orca 创建/派出一个 Worker（subagent）执行任务。
2. Worker 完成任务并上报结果，结果进入对话等待队列。
3. 主 Agent 继续执行完当前任务后，尝试接收/展示 Worker 的上报，此时触发上述报错。
4. 手动 Retry 后，subagent 的信息才会正常上报到主会话。

## 期望行为

Worker（subagent）完成任务后的上报应正常送达主 Agent 会话，无需手动重试。

## 实际行为

首次上报失败并抛出 `cancelled-before-dispatch: Session send was cancelled before vendor dispatch` 错误；只有手动 Retry 后才会成功上报。
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**版本区域**: CN
**OS**: win32 x64 (10.0.26100)
**界面语言**: zh-CN

Start by reproducing the Orca Worker result flow described in the issue on the listed Windows client version, then trace the first `Session send` attempt that produces `cancelled-before-dispatch`. Compare the initial delivery with the successful manual Retry and verify that a completed Worker result reaches the main Agent session without user intervention.

Written by the indexing model from the issue text.