A batch died on "header is not defined": the model referenced a const from
the PREVIOUS batch's script, but every script runs in a fresh sandbox. The
error now says so and points at the fix (reference the node by its id
string), and the program-DSL contract states it up front.
The transcript's markdown also painted every span at the wrap ESTIMATE
(6.6px per unit) while skia draws real glyph advances, so each span after
the first sat at a slightly wrong x - code chips drifted off their words
and a sentence read as fragments. Paint now advances by the measured width;
wrapping stays estimate-based, since it must stay backend-free.
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