[Requests and ideas] Allow opening subfolder in large monorepo

**Mood:** 😊
**Category:** Requests and ideas

We’re using a large monorepo containing multiple sub-applications, where each application has its own .github folder with Copilot instructions and skills.

The current challenge is that GitHub Copilot App always opens the repository from the repository root. Because of that, instructions and skills located inside sub-application folders are not automatically discovered or applied in a clean way.

Example:

```
repo/
.github/
app1/
.github/
instructions/
skills/
app2/
.github/
instructions/
skills/
```

In practice, this makes it difficult to have isolated Copilot context per application inside a monorepo.

What we would like is either:

- The ability to open a specific subdirectory/application as the effective workspace root
- Automatic discovery and inheritance of .github instructions/skills from the nearest parent directory of the files being worked on
- Better first-class monorepo support for application-scoped Copilot configuration

Right now, monorepo setups require centralizing everything into the repository root, which becomes difficult to maintain for large repositories with multiple independent applications and teams.

---
| Field | Value |
| --- | --- |
| App version | 0.2.8 |
| OS | Windows 10.0.26100 |
| Theme | Fox |
| Path | /chat |
| Tenure | Day 2 (Week 1) |