The PM interview question most candidates answer wrong: "Your AI agent accidentally books $5,000 in flights. Who's liable?" The instinctive answer is full refund, no questions asked. Generous. User-first. Sounds right. The interviewer pushes back immediately. Full refund creates moral hazard. Users test limits when they know there's no consequence. The refund is the safety net. The scope limits are the railing. The best candidates know the difference before they're asked. Here's what the…