Scenario: HyperMirror is compromised
Assume an attacker fully controls the platform and its agent key. They can submit orders for accounts that approved an agent, which means they can trade badly and cost money. They cannot withdraw to their own address, because an agent signature cannot express a withdrawal.
The bound on damage is structural rather than procedural: caps limit position size and leverage, and each leader's sleeve is a separate sub-account, so the exposure is not a single unbounded book.