Add a Tracker

To integrate a new tracker cleanly:

1. Add a module under boxmot/trackers/<name>/.
2. Implement a tracker class that subclasses BaseTracker and defines update().
3. Register it in boxmot/trackers/tracker_zoo.py.
4. Export it from boxmot/trackers/__init__.py and boxmot/__init__.py.
5. Add a default YAML under boxmot/configs/trackers.
6. Add a tracker doc page and wire it into mkdocs.yml.
7. Extend tests and CI matrices where needed.

Minimum checklist

• tracker implementation
• tracker registration
• tracker YAML
• docs page
• tests
• workflow matrices if benchmarked in CI