QICT: Receiver Distinguishability and the Spectral Derivation of Standard-Model Structure

This paper formulates Quantum Information Copy Time (QICT) as a relational receiver–spectral closure for quantum information copy time. A receiver is not an observer postulate; it isa finite operational boundary, represented by a quotient algebra and by projectors selecting thedegrees of freedom that can be distinguished at that boundary. Imposing receiver distinguishabil-ity, fixed-point-free copy opposition, oriented endpoint transport and first-order opposite localityselects the finite algebra AF ≃C ⊕H ⊕M3(C) and the primitive endpoint denominator q= 14.The neutral Takagi extension gives qν = 21, θPMNS13 = π/21, a negative leptonic Jarlskog branchand the mass sum imi = 0.072810131 eV. Independent finite-channel contractions generateCKM, electroweak and receiver-reconstruction ledgers with explicit exclusion criteria. Unlikegrand-unified or string-theoretic embeddings, the construction does not begin from a simplegauge group, extra dimensions or compactification data; it begins from a finite receiver quotientand derives the internal algebra before numerical comparison. A new prospective signature ispredicted: a receiver-null boundary-to-Majorana endpoint echo with quadratic onset, phase max-ima π/21 + 2πa/3, and period ratio 3/2. The online resources provide derivations, finite traces,determinant and residue calculations, numerical simulations, and audit code.