V.D251 — Structural Hubble Parameter h = 2/3 + ι_τ²/W₃(3)

h = 2/3 + ι_τ²/W₃(3) = 0.67352 at −120 ppm. Base 2/3 = EdS matter-dominated exponent. Correction κ_B/17 = EM coupling / dominant CF window. Upgraded Wave 38C: derived from τ-Einstein equation.