Not possible to select a skill from the suggestion list

### Describe the bug

- Create a skill "my-test-skill"
- Then make sure it is loaded
- Start typing `/test`
- copilot-cli shows the skill
- press enter to select it results in `Unknown command /test`

### Affected version

_No response_

### Steps to reproduce the behavior

_No response_

### Expected behavior

`/my-test-skill` is selected and I d not need to type it manually

### Additional context

_No response_