/**
 * True when the envelope cannot authorize the work still ahead of it.
 * marginMs treats "expires within the margin" as expired, so a run stops
 * BEFORE burning a turn whose writes are already doomed. Unparseable
 * expires_at counts as expired: never proceed on a malformed authority bound.
 */
export declare function envelopeExpired(envelope: {
    expires_at: string;
}, now?: number, marginMs?: number): boolean;
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