learn-content-engine - v0.20.0
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    Type Alias SetVisibility

    SetVisibility: "visible" | "hidden"

    Consumer-display hint for a set (#83). "visible" is the default; "hidden" asks a consumer app NOT to surface the set to learners (e.g. a conformance/reference fixture that must stay on disk for engine validation but is not learner content). It is a DISPLAY hint only: the engine never excludes a hidden set from validation or conformance.