Workcat's tail flick (-15% left), paw reach (+9% right), and stretch motions
extend beyond the nominal cat bounding box. Previously, frames were drawn
onto a compact 144x110 canvas without padding, causing negative offsets
(e.g. ox=-22px on tail) to truncate the tail tip and create mismatched scales.
Fixes:
- Added padding (pad_x=20%, pad_y=20%) to the render canvas so all extended
poses (tail swings to x=16, paw strikes to x=185) fit completely without clipping.
- Unified the coordinate system: walk, tail, stretch, paw, and scruff now share
the exact same body scale (height ~93-94px) and feet baseline (y=128).