Identified and fixed rendering/input optimization issues:
- Snake: added turn queue (max 2 pending turns) so rapid key presses are
never lost; filters reversals and duplicates against the last queued
direction. Batched snake body rendering into a single XFillRectangles call
instead of one XFillRectangle per segment.
- Tetris: batched settled-block rendering into 3 XFillRectangles calls
(body, highlight, shadow) instead of 5 XFillRectangle calls per cell.
This reduces ~1000 X11 calls per frame to 3, fixing frame drops and
input lag.
- Both: non-blocking input polling before every frame (already in place)
ensures no keypress is missed.
Luxferre
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