export interface StudioSelection {
    activeAgent: string;
    activeModel: string;
    updatedAt: string;
}
/** Load the saved selection, or null if missing/malformed. */
export declare function loadStudioSelection(root: string): StudioSelection | null;
/** Save the selection atomically (tmp file + rename). */
export declare function saveStudioSelection(root: string, selection: StudioSelection): Promise<void>;