What a fifth class file costs the gate, before the fifth one lands.

scripts/check.sh:1354 reads the class tokens off Class/*.lua and runs the harness once per shape: thirteen runs today, twenty-eight at nine classes, and the harness is the slowest thing in check.sh. Measure one run before item 56 lands and again after.

HUNTER at scripts/check.sh:1377 is the proof that the class-agnostic parts stand up with nothing registered, and item 56 eats it silently. Replace it in the same commit with a token no class file can claim, and say in the comment above the loop that the token is deliberately not a class.