Arena CEO @ml_angelopoulos on how they're expanding their AI leaderboards after a $200M Series B to track agents that lie to users, delete files without permission, and bypass safeguards: "Arena, we started as a human preference platform. But these days we've moved very, very far beyond that." "As of today, we've expanded the mandate of this evaluation platform even further into the arena of alignment. One is about the models taking unauthorized actions." "The second is about deceptive…