IV.D370 — Quark Triplet σ-Matrix Parameters

Koide Q for quark triplets at PDG 2024 current masses: Q_up(u,c,t)=0.8487 (+273,114 ppm from 2/3), Q_down(d,s,b)=0.7312 (+96,828 ppm). σ-decomposition well-defined (cos sum vanishes) but Q≠2/3. ΔQ_up/ΔQ_down=2.82 with no clean structural match.