This PR improves the model card for **ST-Evidence-7B** by:
- Adding the `video-text-to-text` pipeline tag to make the model discoverable on the Hub.
- Specifying the `cc-by-nc-4.0` license in the YAML metadata.
- Linking the model card to the corresponding paper: [Evidence-Backed Video Question Answering](https://huggingface.co/papers/2607.11862).
- Linking to the official GitHub repository and relevant datasets on the Hub.
- Including the official BibTeX citation.
