auth.provider API
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    Interface MfaChallenge

    interface MfaChallenge {
        expiresAt: Date;
        id: string;
        kind: string;
        metadata?: Record<string, unknown>;
    }
    Index
    expiresAt: Date

    Expiry encoding: Date per A4 two-tier design — see UserSession for rationale.

    id: string
    kind: string
    metadata?: Record<string, unknown>