This PR improves the model card for `Mixture-Code-Qwen2.5-Coder-3B` by adding relevant metadata and usage instructions.
- Added `pipeline_tag: text-generation` and `library_name: transformers` to the YAML metadata.
- Included a "Sample Usage" section based on the official GitHub repository to clarify how this role-specific agent should be loaded within the RecursiveMAS framework.
- Maintained existing links to the paper, code, and project page.
