`cargo fmt --check` is a required step and had drifted across 45 files. Most of
it arrived this week: several operations were written in parallel worktrees and
merged by hand, and a hand-merge resolves conflicts without ever running the
formatter over the result.
No behaviour changes — this is `cargo fmt --all` and nothing else, kept as its
own commit so the next reader can skip it wholesale rather than search it for
one that matters.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
A colour square wave built from equal, opposite swings of red and blue is
not a pure colour pattern: Rec. 709 weights them 0.2126 and 0.0722, so it
carries a luminance square wave of about a seventh of the swing underneath.
Correlating the raw red channel therefore reads a constant floor that the
chroma filter is not meant to remove, which compressed every ratio towards
one - enough that the resolution test could no longer tell a correct kernel
from one twice the size. Correlate the colour difference instead, and write
the derivation of each expected value into the test.
Checkpoint committed by the coordinator, not by the authoring agent: the
session hit its API limit mid-task and left this work uncommitted. Committed
so it survives, NOT because it is finished - expect failing tests and
half-applied changes. The agent resumes from here.
dtourolleandClaude Opus 5