### Check for existing issues

- [x] I have searched the existing issues and checked that my issue is not a duplicate.

### The Feature

Add support for the Command Code API (https://api.commandcode.ai) as a LiteLLM provider.

Command Code currently exposes a custom streaming API at:

~~~ POST https://api.commandcode.ai/alpha/generate ~~~ The API is not OpenAI-compatible today, but it appears stable and externally callable with:

* bearer authentication * versioned headers * streaming event responses * tool call events * reasoning deltas

A provider adapter in LiteLLM would allow Command Code models to be exposed through the standard OpenAI-compatible LiteLLM proxy surface (/v1/chat/completions).

This would make Command Code usable with:

* Hermes * OpenCode * Cline * OpenAI-compatible coding agents/tools * existing LiteLLM routing/load-balancing infrastructure

Known integration details discovered during testing:

Required endpoint

~~~ https://api.commandcode.ai/alpha/generate ~~~

Required headers

~~~ Authorization: Bearer <API_KEY> Content-Type: application/json x-command-code-version: 0.24.1 ~~~

Required payload structure ~~~ { "config": { "workingDir": "/tmp", "d…