Asset equivalence classes
Content-hash-verified duplicate groups from R-EQUIV-1. Same content = same LO;
grade-specific usage lives in
role. Primary = earliest grade in the class.
Primary = earliest grade; carries the canonical LO tag(s)
Recalls = later grades inheriting the primary's LO(s)
Tier: exact = byte-identical hash · variant = trivial diff · pending = needs review
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