A map-time Expose arrives before the game has a current piece, and the
game's full-redraw path then draws a bogus piece over the top row: visible
as a blanked well border with stray X tiles (the previous commit's
screenshots showed it). The window is never obscured in this session, so
drop the mask, drop the Expose branch, and note the reason in HANDOFF.md.
Refreshed with verify.sh: move 354/18, panels 346/12, quit 300/10, all
with focus=00400001; evidence re-captured and clean.
opencode.energia.arti.ee
5dd01629b9