Proposal: Add Grok CLI as a first-class provider

[thuanlm215]

Hi maintainers,

I would like to propose adding Grok CLI as a first-class provider in CAO.

Grok now has a coding CLI that fits the same general workflow as the other interactive agent providers supported by CAO. Adding it would make it possible to use Grok alongside Codex, Claude Code, Kiro, and the other providers in supervisor–worker and cross-provider workflows.

Proposed scope

At a high level, I expect the integration to cover:

• launching and configuring the Grok CLI through CAO;
• detecting startup, idle, processing, completion, and user-input states reliably;
• sending prompts and handling multi-turn interactions;
• supporting profile options such as model selection where the CLI allows it;
• integrating it into provider selection, validation, documentation, and the Web UI;
• adding unit tests and sanitized terminal fixtures;
• documenting installation, authentication, limitations, and troubleshooting.

I would be happy to work on the implementation. Before starting, I wanted to check a few things:

1. Would the maintainers be open to accepting Grok CLI as a supported provider?
2. Should the integration target the official xAI Grok CLI exclusively, or is there another Grok CLI implementation the project would prefer?
3. Are there any provider-interface changes or ongoing refactors I should account for?
4. Would you prefer the work as one pull request or as a small sequence of PRs?

If this direction sounds reasonable, I can first study the existing provider implementations and post a short implementation plan here before opening a PR.

Thanks!

[thuanlm215]

Moved to issue #578 so the proposal can be tracked as a feature request: #578