- Add n4 parameter support to main.py ESP NOW receiver
- Implement segmented_movement pattern with configurable parameters:
* n1: segment length (number of LEDs per segment)
* n2: spacing between segments
* n3: forward movement speed (positions per beat)
* n4: backward movement speed (positions per beat)
- Pattern alternates between forward and backward movement each beat
- If only n3 or n4 is set, moves in that direction every beat
- Draws repeating segments with spacing across entire LED strip
- Add Pipfile script to run dev.py directly with arguments
