Interface DecisionFlowEvent

interface DecisionFlowEvent {
    action: string;
    approvalState?: "unknown" | "valid" | "revoked" | "expired";
    decision?: "allow" | "deny" | "escalate" | "refuse";
    phase: "check" | "policy_update" | "approval_refresh" | "use";
    policyVersion?: number;
    ts?: number;
}