/**
 * Driving context — which notebook the user is currently viewing, per agent
 * terminal. Reported by the browser (notebook switch, tab focus, launch);
 * consumed by agents via `nebula context` (pull) and via a drift notice the
 * operation route attaches to results (push, at act time — the one channel
 * an agent cannot miss, so it never has to poll).
 *
 * In-memory by design: the browser re-reports on every focus/switch, so
 * state heals within seconds of a server restart.
 */
declare class DrivingContext {
    private byTerminal;
    setDriving(terminalId: string, notebook: string): void;
    getDriving(terminalId: string): {
        notebook: string;
        at: number;
    } | null;
    /**
     * One-line drift notice when `targetNotebook` differs from what the user is
     * viewing — once per switch. Operations on the driving notebook re-arm the
     * notice (so a later switch away notifies again).
     */
    driftNotice(terminalId: string, targetNotebook: string): string | null;
    clear(): void;
}
export declare const drivingContext: DrivingContext;
export {};