GCFT CDN-173: Long-T Acoustic Floor Confirmation — v*/cₛ → 1 at T=20σ/cₛ, D7 Paid, σ=16

CDN-173 is the long-T confirmation run pre-registered in CDN-172 (Project Aporion, General Coherence Field Theory). σ=16; Δ∈0. 006, 0. 010, 0. 020; T = 20σ/cₛ per block (T ≈ 4500–8500, T/τₗocal ≈ 20) ; 15 simulation pairs. The ratio v*/cₛ decreases from CDN-172 short-T values 1. 392, 1. 244, 1. 145 to 1. 241, 1. 173, 1. 107 — all below the pre-registered threshold of 1. 25. The acoustic floor cₛ (Δ) = √ (Δ/ (Δ+4) ) is confirmed as a physical lower bound on coherence-domain nucleation velocity for Δ > Δc = 1/σ². Confirmed physical law: v* (Δ) → maxcₛ (Δ), Vcanon as T/τₗocal → ∞. Deliverable D7 (acoustic floor) is paid in full. Lock code: CDN173ACOUSTICFLOORCONFIRMEDD7PAIDT20TAUSIGMA16