IV.T203 — Neutron Lifetime Precision Prediction

τ_n = K/(|V_ud|²·(1+3g_A²)·f·(1+Δ_r)) ≈ 878.7 s. Bottle average 878.4±0.5 s → +340 ppm (<1σ). Beam average 887.7±1.2 s → −10200 ppm (~7.5σ excluded). τ³ prediction selects bottle value. Zero free parameters.