This PR significantly improves the model card for MetaStone-S1 by:
- **Enhancing metadata**: Adding `pipeline_tag: text-generation` for better discoverability on the Hub (e.g., at https://huggingface.co/models?pipeline_tag=text-generation) and `library_name: transformers` to enable the "how to use" widget and proper library recognition. Specific tags like `test-time-scaling`, `reflective-model`, `mathematics`, `code`, and `reasoning` have also been added for more precise categorization.
- **Consolidating key links**: Moving the paper (now linking directly to the Hugging Face Papers page), project page, and GitHub repository links to a prominent position at the top for quick access.
- **Providing a basic usage example**: Including a `transformers` code snippet to allow users to easily load and perform basic text generation, while still directing them to the official GitHub repository for the full reflective reasoning pipeline.
