J9 juice: the marker shimmers. Each character of the 5-wide marker
samples its own foreground color from a horizontally-traveling wave
between a bright peak, a dim trough, and an accent highlight on
the off-phase. The bg stays a constant low-key tint, so what the player
sees is the TEXT itself sliding through colors — not a flashing box.
In the final 20% of life the wave speeds up and the trough darkens so
a soon-to-expire powerup visibly accelerates without losing legibility.
Screen coordinates of the focal cell (“the asshole”) for the given
zoom level + biscuit rect. Used by hands::draw to orbit the ring
around the visual cuque center rather than the bounding-box center
(which differs by up to 1 column in TINY/FULL because each art’s
asshole_col isn’t exactly width / 2).