Add task category, clean metadata, and add project/code links

This PR adds the `robotics` task category to the YAML metadata, removes the arXiv ID from metadata to comply with dataset card guidelines, and adds links to the project page and GitHub repository in the README content.

README.md

@@ -1,5 +1,7 @@
 ---
 license: apache-2.0
+size_categories:
+- 1M<n<10M
 tags:
 - embodied-ai
 - vla
@@ -8,12 +10,15 @@ tags:
 - object-search
 - OVON
 - qwen
-- arxiv:2610.23841
-size_categories:
-- 1M<n<10M
+task_categories:
+- robotics
 ---
+
 # StopWatch navigation data
 
+Project page: [https://stopwatch-nav.github.io/](https://stopwatch-nav.github.io/)  
+Code: [https://github.com/amazon-far/stopwatch](https://github.com/amazon-far/stopwatch)
+
 Training trajectories for the perception and policy
 models, plus the released ObjectNav evaluation episodes and scoring viewpoints.
 RGB and semantic supervision are rendered locally from the recorded poses.