Ueda — dx/dt=y, dy/dt=−k·y−x³+B·cos(z), dz/dt=1. Classic chaotic k=0.05 B=7.5. Dual k+B sliders. Display embed (x,y,sin z). Distinct from colpitts.html, chua.html, lorenz.html, tsucs.html, duffing (not shipped). Bulk centroid ≈ (0.0823, 0.0015, -0.0002). RK4 Ueda fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.