/**
 * Stale-sweep: prune dead heartbeats + orphaned pid-map + prompt hash
 * files.
 *
 * Runs after session.started to clean up crashed-peer detritus before the new
 * session's UX layer reads peer state.
 *
 * Freshness threshold defaults to 600s; configurable via the
 * HARNERY_AGENT_COORD_FRESHNESS env var or `.harnery/config.jsonc`
 * `coord.freshness_seconds` (see `coordFreshnessSeconds`).
 */
export declare function staleSweep(coordRoot: string): {
    heartbeatsRemoved: string[];
    pidmapsRemoved: number;
    peerHashesRemoved: number;
    resourceHashesRemoved: number;
};
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