The mascot shrinks a step when it yields to a card, and the overlap test read
getBoundingClientRect, which reports the scaled box. So a card resting at the
mascot's edge drove a loop: overlap, shrink, no overlap, grow, overlap again,
every poll tick.
Measure the layout box instead — centre plus offsetWidth/offsetHeight, which
the yield transform doesn't move. Hysteresis would have hidden the pulsing;
this removes the path that caused it.
Claude-Session: https://claude.ai/code/session_01GJHNvirh7Hzhc9RL3HAvz7
prosolis
047f4ae67f