Field–Noyes Oregonator (BZ) — dx/dt=(1/ε)·(x+y−q·x²−x·y), dy/dt=−y+f·z−x·y, dz/dt=(1/ρ)·(x−z). Classic f=1.0 ε=0.04 ρ=1 q=0.008. Dual f+ε sliders. Display embed (x,y,z). Distinct from willamowski.html, rossler.html, hindmarsh-rose.html, duffing.html, lorenz.html. Bulk centroid ≈ (11.9053, 0.5972, 1.6898). RK4 chemical oscillator. Gold low-alpha trail, cap 650. RM = settled silhouette, no animate-on.