Add support for executing recipe steps via Grok API streaming, including parameter defaults from YAML, model selection via flags/config, previous step context, and a final summary prompt. Update runner to handle client and model, and refine loader to apply user params with fallbacks.
- Simplify import comments and error handling in cmd/recipe.go
- Streamline regex comment in internal/recipe/loader.go
- Enhance console output and add LLM placeholder in internal/recipe/runner.go