Row 56 is a gym's dialog for thirty brain minutes with YES, NO and NEXT dealt
in equal thirds, so the question is which box each press is answering and
whether the seam can see it at all. `state::drawn_boxes` asks the screen
instead of a pinned rectangle: every complete `TextBoxBorder` on the frame.
`FLY_PROBE_CATCH=dialog` walks the conversation one raw pulse at a time and
prints both readings of every frame side by side, with the pad the palette
deals for it, and tallies how the candidate readings separate the frames.
`FLY_PROBE_ANSWER` picks the button a frame with a box on it is answered with,
so the two arms of a choice can be walked separately.
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