C.2.4:4.0a - Kind and characteristic boundary

U.ArticulationExplicitness is a dependent durable characteristic value under the declared U.LanguageStateSpace / U.CharacteristicSpace boundary, not a root U-kind. Its identity is the articulation-explicitness basis slot and ordinal scale discipline for governed episteme publication positions. Local thresholds, route labels, and score-table columns may reference it, but they do not create a separate U-kind.