V.R379 — V.OP2 Status after Sprint 6C: SA-i mod-5 Mechanism Proposed

V.OP2 after Sprint 6C: η_B=α·ι_τ^15·(5/6) confirmed at -10320 ppm (within 1σ Planck). SA-i mod-5 mechanism proposed: ι_τ^15=(ι_τ³)^W₃(4) from 5-fold holonomy winding. (5/6)=W₃(4)/(2·sectors) structural. Mechanism is conjectural pending formal proof. Parallel to Strong CP (SA-i mod-3, IV.T160) established.