/**
 * Whether a persisted negotiation task still admits an exclusive conversation
 * lock. A paused `ask_user` consultation holds the lock for its complete
 * answer window plus expiry-worker slack; ordinary active turns use the
 * existing five-minute freshness window.
 */
export declare function holdsNegotiationConversationLock(task: {
    state: string;
    updatedAt: Date;
}, now?: number): boolean;