Langford — dx/dt=(z−β)x−ωy, dy/dt=ωx+(z−β)y, dz/dt=λ+αz−z³/3−(x²+y²)(1+ρz)+εzx³. Classic α=0.95 β=0.7 λ=0.6 ω=3.5 ρ=0.25 ε=0.1. Dual α+ω sliders. Display embed (x,y,z). Distinct from lorenz.html, rossler.html, thomas.html, arneodo.html. Bulk centroid ≈ (0.0031, -0.0016, 0.7001). RK4 chaotic fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.