GCFT CDN-171: Long-T Convergence — v* ∝ 1/σ Confirmed, D6 Paid

CDN-171 closes D6 (canonical kinetics window) for the linearised spintessence system (CDN-166, Δ=0). Chunked RK4 integration with numpy state checkpointing runs σ∈{32,64} to T/σ²∈{17.6,11.7} (≈1 gapless oscillation period τ=4πσ²). At long T, v*=0.887×1/(2σ) at σ=32 and v*=0.850×1/(2σ) at σ=64; combined four-point fit gives v*=0.498σ⁻¹·⁰²⁹ (exponent −1.029±0.03, canonical −1.000). The CDN-170 transient exponent n=−0.55 is confirmed as an artefact of T/σ²<4. D6 is paid: canonical kinetics requires Δ≤1/(σω)².