/**
 * Shared liveness seam between the intake route and the LongRunningSupervisor.
 *
 * The route writes via touch(); the supervisor reads via lastAliveAt(). Both
 * reference the same MapLivenessStore instance — no channel, no IPC, just a
 * plain in-process Map.
 *
 * Silence-kill contract (from the supervisor spec). On silence the supervisor
 * kills the scaffold child process (python `-m scaffold`) for that scanner; the
 * resulting exit feeds the normal restart-with-backoff path (subject to the
 * crash-loop guard), which relaunches it:
 *   - null  → heartbeat not yet started; silence-kill stays disarmed.
 *   - 0     → a real epoch-ms timestamp (boundary value, not "never").
 *   - >0    → last POST timestamp; kill the scaffold child if
 *            Date.now() - ts >= maxSilenceMs.
 */
export interface LivenessStore {
    /** Called by the route's updateLiveness on every accepted POST. */
    touch(scannerId: string, now: number): void;
    /** Called by the supervisor's lastAliveAt callback on every silence poll. */
    lastAliveAt(scannerId: string): number | null;
}
/**
 * Default Map-backed implementation. A future durable store will
 * implement the same interface; swap without touching callers.
 */
export declare class MapLivenessStore implements LivenessStore {
    private readonly store;
    touch(scannerId: string, now: number): void;
    lastAliveAt(scannerId: string): number | null;
}
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