The reviewer's round 2 verified all nine round-1 corrections by re-measuring
them, then failed the commit on the one thing it added that the repo's own bar
forbids: a two-line docstring on _TinyDense. p1-6.4 still lists "comments to one
line" as open work, so a new commit should not widen it. The 470MB rationale
already lives in CHECKLIST.md.
Also cites the CI run for the commit under review (37744547992 @ 20c0416, also
success) instead of stopping at the previous one.