- Rescale SLOW_WALK speed from [0.2, 0.8] to [0.0, 0.8] so dead zone
edge produces zero speed instead of jumping to 0.2 m/s
- Add acceleration rate limiter (0.01/frame = 0.4s ramp at 200Hz)
that smooths speed increases but allows instant deceleration
- Fixes exaggerated first steps caused by instant IDLE to 0.2 m/s jump
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>