Use organization agents outside of github repo directory

### Describe the feature or problem you'd like to solve

Custom org agents can only be used when working in a github directory

### Proposed solution

We would like to develop custom agents and allow our employees to use them for doing their work using copilot cli. However, they only work when working in a github directory. It would be nice if any logged in user could utilize the custom agents in the .github-private repo without working in a github directory.

### Example prompts or workflows

_No response_

### Additional context

_No response_