- Add --timeline flag to overlay frame numbers as ruler at bottom
- Add --start and --end parameters to process video segments
- Timeline shows evenly-spaced frame numbers with tick marks
- Timeline always horizontal from left to right at bottom
- Segment processing maintains actual frame numbers in timeline
- Update all extraction and analysis functions to support segments
- Add --relax option to include N frames before/after threshold frames
- Implement two-pass approach for relax feature
- Generate PowerShell command in debug mode to test all suggested thresholds
- Place debug mode outputs in results/debug folder by default