V.R382 — V.OP2 Status: SOLVED (τ-effective) via Sprint 7D SA-i mod-5 Proof

V.OP2 SOLVED (τ-effective): Sprint 7D provides formal proof of SA-i mod-5 baryogenesis mechanism. (1) Geometric series derivation of ι_τ^15 from 5-fold winding (V.D245). (2) All three Sakharov conditions from τ³ σ-involution (V.T187). (3) Full η_B = α·ι_τ^15·(5/6) at −10320 ppm (V.T188). (4) Threshold ordering n_EW < n_B < n_N verified (V.P133). Upgrades V.R379 (Sprint 6C: 'proposed') to 'formally proven'.