A test walks every effect parameter the .aep table maps to a recorded After
Effects definition (fx_defs) and checks that the effect's hard range
(ParamUi::Slider min..max, what prop.set and the value editors clamp to)
covers After Effects' valid range, converted to EffectCraft's units the way
the importer converts values. Conv::number_scale is that conversion, now
shared by the importer and the test.
The parameters still narrower are allow-listed by issue (#3460-#3492); the
test fails on a new narrower parameter and on a row that is no longer
needed, so the list shrinks as the issues are fixed.