export interface TraceSignal {
    id: string;
    pattern: string;
    strength: number;
    lastReinforced: Date;
    decayRate: number;
}
export interface ResidualMemoryOptions {
    filePath?: string;
    defaultDecayRate?: number;
}
export declare class ResidualMemory {
    private signals;
    private filePath?;
    private defaultDecayRate;
    constructor(options?: ResidualMemoryOptions);
    record(pattern: string, strength: number): void;
    decay(): void;
    getActive(threshold?: number): TraceSignal[];
    toPromptHints(maxHints?: number, maxLength?: number): string;
    save(filePath: string): void;
    load(filePath: string): void;
    clear(): void;
    count(): number;
    private findByPattern;
    private pruneBelow;
    private maybeSave;
}
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