/** Legacy persisted negotiations without an explicit cap finalize at six turns. */
export declare const DEFAULT_NEGOTIATION_MAX_TURNS = 6;
/**
 * Canonical negotiation turn-cap predicate.
 *
 * Missing/null legacy metadata uses the six-turn default. Zero is the explicit
 * uncapped sentinel. Only a positive limit can be reached or exceeded.
 */
export declare function isNegotiationTurnCapReached(turnCount: number, maxTurns: number | null | undefined): boolean;