The Supervisor's Trap. Panel A: a fold bifurcation with coexisting complacent and engaged stable arousal states. Panel B: with the arousal-gated interlock intact, the system self-stabilises with zero incidents. Panel C: with the interlock broken, a chronic incident cycle. The Supervisor's Trap (dark theme). Panel A: fold bifurcation. Panel B: interlock intact, stable. Panel C: interlock broken, chronic incident cycle.