## CHANGES
- Add model-specific raw mode detection logic
- Check Ollama llama2/llama3 models for raw mode
- Check OpenAI o1/o3/o4 models for raw mode
- Use model from options or default chatter
- Auto-enable raw mode when vendor requires it
- Import strings package for prefix matching
## CHANGES
- Add NeedsRawMode to Vendor interface
- Implement NeedsRawMode in all AI clients
- Return false for all implementations
- Support model-specific raw mode detection
- Enable future raw mode requirements