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- test_nano: every hex digit of B data is one drawDots() call, never single drawPixel() calls (the slow path that broke dense images in 2.19.2) - tools/display_smoke_test.py: all yellow, a dense image and a checkerboard in live mode on the real display; fails on any frame check problem (wrong image, no answer, Nano restart, ERR reply) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>