include-references-use-case-usage.fixed.md

• An include whose target is a use case definition, or any other non-feature, is now rejected in default mode with Must reference a use case. and includes target must be a usage, found useCaseDef at the target's span, as the pilot validator reports; perform and exhibit of a definition draw the kind message the same way, and an alias is followed to its target. Includes of use case usages — direct, typed, with a body, by qualified name, via alias or inside a use case usage — stay clean.