Add the arXiv link (2611.16701) to the model card

Links the technical report on arXiv and gives the BibTeX entry its eprint fields.

README.md

@@ -25,7 +25,7 @@ not redistributed here; the code fetches them from their original repositories a
 
 - Code: https://github.com/AlayaLab/sprint3d
 - Project page: https://alaya-lab.github.io/sprint3d/
-- Technical report: *Sprint3D: Accelerating End-to-End 3D Asset Generation through Pipeline Optimization* (arXiv link to follow)
+- Technical report: [arXiv:2611.16701](https://arxiv.org/abs/2611.16701), *Sprint3D: Accelerating End-to-End 3D Asset Generation through Pipeline Optimization*
 
 ## Files
 
@@ -69,12 +69,14 @@ with, endorsed by or reviewed by Tencent or the authors of Pixal3D.
 ## Citation
 
 ```bibtex
-@article{kuno2026sprint3d,
-  title   = {Sprint3D: Accelerating End-to-End 3D Asset Generation through Pipeline Optimization},
-  author  = {Kuno, Sho and Yu, Ruihan and Yu, Yonghao and Lin, Guixu and Fu, Lian and Niu, Muyao and
-             Tsai, Yu-Ju and Huang, Zheng-Hui and Huang, Yi-Chuan and Yang, Siqi and Lan, Fengbo and
-             Wu, Erwin and Zhang, Kaipeng and Wang, Zhixiang},
-  journal = {arXiv preprint},
-  year    = {2026}
+@misc{kuno2026sprint3d,
+  title  = {Sprint3D: Accelerating End-to-End 3D Asset Generation through Pipeline Optimization},
+  author = {Kuno, Sho and Yu, Ruihan and Yu, Yonghao and Lin, Guixu and Fu, Lian and Niu, Muyao and
+            Tsai, Yu-Ju and Huang, Zheng-Hui and Huang, Yi-Chuan and Yang, Siqi and Lan, Fengbo and
+            Wu, Erwin and Zhang, Kaipeng and Wang, Zhixiang},
+  year   = {2026},
+  eprint = {2611.16701},
+  archivePrefix = {arXiv},
+  primaryClass  = {cs.CV}
 }
 ```