CDN-147: M33 as M31's Leo I — GCFT Density-Screened Orbit Ensemble Null Result

Pre-registered orbital test of CDN-142 density-screened GCFT coupling using M33's orbit around M31 as a discriminating observable. A 3000-orbit ensemble integrates M33 trajectories under ΛCDM NFW and GCFT-modified potentials (κ=0.15, ρ_crit ∈ {10³, 10⁴} M☉/kpc³). The pre-registered kill condition targets pericenter distance r_peri as the discriminating observable. Result: Δr_peri = 0.0 kpc (KS p=1.0) — kill condition triggered. The inner density screening creates an exact energy degeneracy at pericenter: angular momentum L = r × v_t is identical in both models, so r_peri is unchanged. The t_peri signal (Δ = −40 Myr, KS p≈0) is statistically significant but unobservable with current data. M33 pericenter distance is not a discriminating test for the density-screened coupling architecture. Redirects to Leo I/II proper motion tests via Gaia DR4.