make the copilot cli hub configurable, context state branch etc

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

have to use /context and a bunch of other things to figure out what is going on with the session

### Proposed solution

the configurable hud solution is here:
https://github.com/griches/copilot-hud

Example:

### Example prompts or workflows

_No response_

### Additional context

_No response_

Start by reviewing the CLI's current /context behavior and the configurable HUD proposal at https://github.com/griches/copilot-hud. Done should provide a configurable session display that exposes context, state, and branch information without requiring repeated /context commands.

Written by the indexing model from the issue text.