kitgate re-grades the shipped files and compares against what the finder recorded, on
the principle that two code paths reaching the same verdict is worth more than one path
asserting it. It immediately caught my own bug: staging applied the kit gain at write
time, AFTER grading, so the recorded grade described the pre-staging clip. Several
sub-scores have a level term, so the two differ — 0.875 recorded against 0.925 on disk —
and the gate correctly called that a defect.

Staged clips are now re-graded before the manifest is written, so the number stored is
the number you get by grading the file. Selection still runs on the pre-staging grades,
which is fine and worth stating: the gain is uniform across a kit, so it cannot reorder
its members.

This is the second time the cross-check has paid for itself in a day — it also caught the
stale manifest after restage. A checker that only ever agrees with the thing it checks is
not earning anything.

Also: the report now lists cuts whose CLAP instrument tag contradicts the kit they landed
in. Nothing is re-filed on that basis. For a stem whose filename token is unrecognised
there is no producer label to fall back on, so it lands wherever the coarse measurement
pointed — MAREA's `marea` stem went into the drums kit while CLAP hears a spoken voice.
CLAP is the one signal here that can separate a sung line from a keyboard, so it is used
to say what to audition first, not to decide.

24 tests.