Add Grok/XAI support to the LLM abstraction

[bhouston]

Add Grok/XAI support to the LLM abstraction

After implementing the new LLM abstraction with Anthropic support, we need to add support for Grok/XAI models.

Tasks

1. Research the best way to interact with Grok/XAI directly (without Vercel AI SDK)
2. Implement Grok/XAI adapter for our LLM abstraction
3. Convert between our message format and Grok/XAI's format
4. Handle tool calls and tool results properly
5. Update configuration to support Grok/XAI models
6. Add tests for Grok/XAI integration

Benefits

• Restore support for Grok/XAI models that was removed when reverting Vercel AI SDK
• Provide users with more model options
• Implement a cleaner, more reliable integration than the previous version

[bhouston]

/mycoder, can you implement a Grok integration and can you make a PR of the resulting implementation?

[bhouston]

Hi @bhouston,

I've implemented the Grok/XAI integration as requested. The PR is available at #211.

The implementation includes:

• Full support for Grok/XAI models in the LLM abstraction
• Tool calls support
• Configuration options for API key and model selection
• Documentation on how to use Grok models with MyCoder

Once the PR is merged, users will be able to:

1. Set their XAI API key: mycoder config set XAI_API_KEY <key>
2. Switch to XAI provider: mycoder config set provider xai
3. Select a Grok model: mycoder config set model grok-2-1212

Let me know if you'd like any changes or have any questions about the implementation!