Add pipeline tag and Arxiv link

This PR adds the `image-to-3d` pipeline tag to the model metadata to improve discoverability on the Hugging Face Hub. It also adds a link to the Arxiv version of the paper in the header section of the model card for easier access to the technical details.

README.md

@@ -1,5 +1,6 @@
 ---
 license: cc-by-nc-4.0
+pipeline_tag: image-to-3d
 tags:
 - 3d-reconstruction
 - 3d-generation
@@ -11,7 +12,7 @@ tags:
 
 ShapeR introduces a novel approach to metric shape generation. Given an input image sequence, preprocessing extracts per-object metric sparse SLAM points, images, poses, and captions using off-the-shelf methods. A rectified flow transformer operating on VecSet latents conditions on these multimodal inputs to generate a shape code, which is decoded into the object’s mesh. By applying the model object-centrically to each detected object, we obtain a metric reconstruction of the entire scene.
 
-[Project Page](http://facebookresearch.github.io/ShapeR)  |  [Paper](https://cdn.jsdelivr.net/gh/facebookresearch/ShapeR@main/resources/ShapeR.pdf)  |  [Video](https://www.youtube.com/watch?v=EbY30KAA55I)  |  [HF-Model](https://huggingface.co/facebook/ShapeR/)  |  [HF Evaluation Dataset](https://huggingface.co/datasets/facebook/ShapeR-Evaluation)
+[Project Page](http://facebookresearch.github.io/ShapeR)  |  [Arxiv](https://arxiv.org/abs/2601.11514) | [Paper](https://cdn.jsdelivr.net/gh/facebookresearch/ShapeR@main/resources/ShapeR.pdf)  |  [Video](https://www.youtube.com/watch?v=EbY30KAA55I)  |  [HF-Model](https://huggingface.co/facebook/ShapeR/)  |  [HF Evaluation Dataset](https://huggingface.co/datasets/facebook/ShapeR-Evaluation)
 
 ## Usage