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
Implement the `recipe` command with `run` subcommand for executing transactional recipes.
- Resolve recipe paths: explicit, project-local (.grokkit/recipes), or global (~/.local/share/grokkit/recipes) with user prompt.
- Load and parse recipes using internal/recipe package.
- Integrate with root command and project root detection.
