This paper reconstructs the Standard-Model gauge skeleton from Finite Distinguishability Closure (FDC) and its quantum-representational reading, Phase-Flow Coherence (PFC). The aim is not to force the Standard Model into a simple parent group, but to determine whether a simple-group origin is structurally required. The result is structural. The SU(3), SU(2), and U(1) gauge sectors are reconstructed as arising from three irreducibly distinct closure sources rather than from the breaking of a prior unified force. The paper derives or bounds the Standard-Model gauge skeleton, the minimal one-generation chiral matter pool, hypercharge ratios, anomaly cancellation, the Z6 global form, three-generation slot architecture, relativistic readout bridges, and coupling-normalization boundaries. The paper argues for structural-origin GUT-scope completeness: it addresses the structural-origin component of the GUT problem by asking whether Standard-Model gauge sectors require a simple parent group. It concludes that simple-group unification is an optional bridge rather than an FDC consequence. Coupling constants, full RG running, Yukawa coefficients, CKM/PMNS values, CP phases, neutrino mass mechanism, proton-decay phenomenology, and gravity remain open. This version v3.8 is intended as a priority-establishing preprint of the structural-origin GUT-scope reconstruction. It is not presented as a completed conventional GUT model, but as an upstream reconstruction of the Standard-Model gauge skeleton and a structural no-forced-simple-group result.
T Momose (Thu,) studied this question.