🎡 Triple Pendulum Simulator: Lagrangian Chaos, Lyapunov Exponent and Trajectory Divergence — 2D Phase Space and Flip Map

2D companion of the triple pendulum lab: the pendulum with a twin started a hair away, phase portraits, integrator energy error, Lyapunov separation growth, spectrum with normal modes and a click-to-start flip-time map from the same physics module.