* Add AlphaTracker format reader Implements reading support for AlphaTracker JSON annotation format, which stores multi-animal pose tracking data with bounding boxes and keypoints. - Add alphatracker.py module with read_labels() function - Integrate AlphaTracker support into main.py load_file() - Add format detection for AlphaTracker JSON files - Include test fixtures and comprehensive test coverage - Support for ImageVideo backend with frame sequences Fixes #226 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> * Add edge case tests for AlphaTracker format detection - Test empty list JSON - Test non-dict first frame - Test annotations not being a list - Test malformed JSON and non-existent file - Achieves 100% coverage for new PR code 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> * Apply ruff linting fixes - Reorder imports to follow standard convention - Format code according to project style 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> * Add AlphaTracker format to documentation - Add to formats.md API reference - Add to supported formats list in index.md - Enhance module docstring with format description - Update load_file docstring to include AlphaTracker 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> * Fix line length in AlphaTracker module docstring - Break long lines to comply with 88 character limit - Improves docstring readability 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> * Revise AlphaTracker implementation to dynamically determine skeleton - Remove hardcoded 3-node skeleton assumption - Dynamically determine number of nodes by scanning all frames - Properly group annotations by Face followed by sequential points - Handle extra annotation types that aren't Face or point - Add test for non-Face/non-point annotations - Achieve 98.8% test coverage * Apply linting fixes --------- Co-authored-by: Claude <noreply@anthropic.com>

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[AlphaTracker](https://github.com/talmolab/sleap/blob/369b77280790cc025d8d3af8cdf00c6ba48ef6f9/sleap/io/format/alphatracker.py) #226

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