export declare function initSession(transcriptPath?: string): void;
export declare function getSessionAnimalIndex(): number;
export declare function getSessionPaletteIndex(): number;
export declare function animTick(speedSec?: number): number;
export declare function moodTick(): number;
export declare function sessionUptime(): string;
export declare function recordContextPercent(pct: number): void;
/** Returns context velocity in %/min. Positive = growing. */
export declare function getContextVelocity(): number;
/** Estimate minutes remaining before context is full. Returns null if velocity <= 0 or unstable. */
export declare function getContextTimeRemaining(currentPct: number): string | null;
export interface PetMemory {
    version?: number;
    totalSessions: number;
    totalUptimeMin: number;
    firstMet: number;
    lastSeen: number;
    lastShownTier?: string;
}
export declare function getMemory(): PetMemory;
/** Returns true once when a tier upgrade just happened, then resets. */
export declare function didTierUpgrade(): boolean;
export type RelationshipTier = 'stranger' | 'acquaintance' | 'friend' | 'bestie';
export declare function getRelationshipTier(): RelationshipTier;