GCFT CDN-170: The Decisive sigma-omega Run — CDN-168 Floor Refuted, n = −0.55 Fit, CDN-171 Long-Limit Required

The drag-peak velocity v* falls as sigma^(−0.55) over sigma·omega ∈ {8, 16, 32, 64} in the CDN-166 linearised spintessence code (T ∝ sigma², v ∈ [0.003, 0.13], resolved interior peaks throughout). The CDN-168 quasi-universal floor at v* ≈ 0.12 is refuted. The canonical v* ∝ 1/(sigma·omega) prediction is not yet confirmed because the convergence criterion T ≫ sigma² is met only for sigma ≤ 16; at sigma = 32 and 64 the peak is still descending. The CDN-169 fork remains open: Branch-A non-canonical kinetics loses its only numerical support; Branch-B gains a consistent trend but not a proof. CDN-171 is pre-registered: T = 20·sigma² at sigma ∈ {32, 64, 128}.