classFeatExpansionCanUseFeat excludes ALLCLASSESCANUSE=0 feats from
class feat table masterfeat expansion. When such a feat also has no
MinLevelClass, no class can ever obtain it — a data bug that previously
failed silently (e.g. Spell Focus vanishing from the wizard table).
New validator warns for exactly that case; deliberate exclusions with
an explicit MinLevelClass stay silent.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
