Wander bounds were tied to the letter ring's radius, which sits inside
YES/NO's corner positions — widened to derive bounds directly from the
board's actual outermost fixed waypoints (YES/NO for the top/sides, the
number row for the bottom) so idle drift covers the whole interactive
board, corners included.
Added a periodic deliberate visit to GOODBYE: every 2-5 minutes
(randomized so multiple open tabs don't sync up), the planchette glides
down and rests there for 3-5 seconds with the same restrained glow used
for ambiently-brushed letters, then resumes normal wander. Purely a
visual beat — no session/game state changes, distinct from an actual
goodbye action.