v8: Prismatic After-images

[brycecovert]

Level 1 — v8

Prismatic After-images create a vivid, ghostly trail of Pac-Man's movement, turning his path through the rotating maze into a sweeping rainbow ribbon.

• After-image System: Pac-Man generates a semi-transparent clone of himself every 60ms. Clones are stored in a fixed-size queue and fade out over 500ms.
• Chromatic Shift: Each after-image is assigned a color from the RAINBOW palette, cycling through colors sequentially to create a continuous spectrum trail.
• Rotation Mapping: After-images are anchored to the playfield's coordinate system, meaning they rotate and spin perfectly with the maze and Pac-Man, creating elegant, colorful spirals as he moves.
• Visual Polish: After-images use a globalAlpha fade and a slight scale-down (from 1.0 to 0.8) as they age, creating a tapering effect.