V.D246 — Self-Similar NNLO Correction: δ₁=3/175, δ₂=9/700

NNLO corrections δ₁=3/175 and δ₂=9/700 bridge structural (8/7,6/7) to grid optimum (1.16,0.87). Self-similar: δ₁/δ₂=4/3=(2×lobes)/sectors, same as LO ratio. δ₁=dim(τ³)/((2×lobes+sectors)×W₃(4)²)=3/(7×25). All topology constants.