/**
 * System cleanup core module.
 * @task T4783
 */
export interface CleanupResult {
    target: string;
    deleted: number;
    items: string[];
    dryRun: boolean;
    prunedRows?: number;
    archivedRows?: number;
    archivePath?: string;
}
/** Cleanup stale data (sessions, backups, logs). */
export declare function cleanupSystem(projectRoot: string, params: {
    target: string;
    olderThan?: string;
    dryRun?: boolean;
}): Promise<CleanupResult>;
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