Maggio–Kennedy Colpitts (ideal, k=0.5) — n(y)=exp(−y)−1; dx/dt=(g/Q)·(−n(y)+z), dy/dt=(g/Q)·z, dz/dt=−(Q/g)·(x+y)−z/Q. Classic g=4.5 Q=1.5. Dual g+Q sliders. Distinct from chua.html, lorenz.html, tsucs.html, diffusionless-lorenz.html, pham.html. Bulk centroid ≈ (−2.4953, 2.4817, 0.0017). RK4 Colpitts fold. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.