Direct tests for what was only covered through whole renders, or not at
all: slider clamping and NaN fallbacks, interp, normal_quantile, the
Poisson draws, the emulsion's mix of sizes per seed, the summed-area
table and box sums against brute force (seams, negative coordinates,
other periods) and the footprint limit.
A tile redrawn is now compared with the first one directly:
seed_picks_the_pattern compared a cached tile with itself.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
