Structural Admissibility in La Profilée: The Necessary Conditions for LP-Valid System Description

La Profilée’s persistence constraint IR = R / (F · I · C) ≤ 1 is a structural law: necessary, domain-invariant, non-empirical. But its application is not unconditional. A system description must satisfy five Admissibility Requirements (AR1–AR5) before IR can be meaningfully computed and the constraint applied. These conditions are not conventions or methodological preferences. They are structural prerequisites: their failure renders IR either undefined, unanchored, or structurally meaningless. The present paper derives each of the five conditions from LP’s formal architecture, establishes the specific failure mode associated with each, and shows that AR1–AR5 are jointly necessary and individually sufficient for LP-valid system description. The Admissibility Requirements connect to LP’s identity architecture: AR1 is the existence-dimension analogue of the Constitutive Reading Protocol established in “The Constitutive Reading”, and together AR1–AR5 function as the structural gate through which any system must pass before the four-regime typology established in “The Completeness of Persistence” can be applied.