URL params ?s=<uuid> session room ?amount=<n> starting agent count ?test=1 n8n test mode ?password=<x> echoed in heartbeat ?gui=true open with HUD visible ?n8n=off disable all n8n calls ?pixelGrid=true chunky low-res pixel grid ?resolution=<0-1> render scale at boot (0.1–1.0)
trace text   imprints as agent attractor
font        Google Fonts family or URL
direction   angle = f(x, y, t, idx, cx, cy)
wind       angle = f(x, y, t, idx, cx, cy)