Interface NarrativeMemoryOptions<T>

interface NarrativeMemoryOptions<T = Record<string, unknown>> {
    defaultKind?: { decayHalfLifeMs?: number; autoPurgeBelow?: number };
    now?: () => number;
    onRemember?: (fact: MemoryFact<T>) => void;
    onForget?: (
        fact: MemoryFact<T>,
        reason: "cleared" | "manual" | "purge",
    ) => void;
}