This PR improves the dataset card by:
- Adding `task_categories: [question-answering]` so the dataset is correctly categorized and discoverable.
- Removing the `arxiv:2603.20576` tag from the YAML metadata, since arXiv IDs should only be referenced in the markdown content.
- Adding the official project page link to the markdown content.
The existing usage, layout, and citation sections are kept as-is.
