Function lower_mutation_cache 

pub fn lower_mutation_cache(
    program: &MutationProgram,
    visibility: &MutationCacheVisibility,
) -> Result<MutationCacheProgram, MutationProgramError>

Lower a mutation program to role-safe cache effects.

Authorization and coverage gates are applied by the caller via visibility. When visibility rejects an operation, the narrowest invalidation is emitted instead of a concrete write.

Errors

Returns validation failures for unsupported operation shapes.