Template regen emitted default screen dims; interactive launch crashed after the 250-line window

prove_loop's template regenerate() constructed its CEmitter without screen dimensions, so every regenerated platform.c called ppu_init(256, 240) for every console. Latent for months: the Atari SDL render walk stayed within 240 rows, so the wrong-sized window merely letterboxed.

Raw traces, ROM material, local paths, and personal data are not part of this public record.