🐟 Vicsek Model Lab: Noise-Driven Flocking Order-Disorder Transition — 2D Torus & Order Curve

2D companion of the Vicsek flocking lab: particles on a periodic box with a probe neighbourhood, live order parameter, and a phi(eta) noise sweep checked against the exact all-to-all result sin(eta/2)/(eta/2) and the random-walk floor.