forked from mirror/crumbs-original
The lightness-band guard was looser than the palette it was meant to catch
(old band 0.0175 vs new 0.0246) and the muted-AA test never failed against
the old palette (5.08:1), so both docs' stated expectations and one spec
claim ("chroma roughly doubles") were measured falsehoods. Replace the band
test with an RGB-distance pairwise check, which does discriminate (old
closest pair fog/storm = 7.5, new closest pair coral/peach = 12), fix the
misleading test comment, and correct the spec/plan docs to match reality.