This PR adds the `pipeline_tag` (`robotics`) and `library_name` (`transformers`) to the model card metadata. The `pipeline_tag` improves discoverability of this embodied navigation model, and `library_name` enables Hugging Face to provide an automated usage snippet, since the repository contains `auto_map` entries and configuration files compatible with the Transformers library (loaded via `trust_remote_code=True`).
