Being able to do cross repo work in a single session.

Being able to do cross repo work in a single session. For example: A new task spanning across frontend and backend. I have a custom agent orchestrator in backend that delegates to implementor, test agents, reviewer and so on. The implementor agent only lives in the backend repo, but should be able to make changes in both repos (like it can in the Copilot CLI, by adding the frontend repo directory). Currently it seems not possible to do that?

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| Field | Value |
| --- | --- |
| App version | 1.1.9 |
| OS | Windows 10.0.26200 |
| Theme | GitHub |
| Path | /chat |
| Tenure | Week 2 |

从 /chat 入口开始，跟踪会话如何选择并访问仓库目录。确认后端代理编排器当前如何限定工作范围，然后将完成定义为：一个会话允许实现代理在前端和后端仓库中都进行更改。

由索引模型根据 Issue 内容生成。