/**
 * Remove expired dispatch state files from the given directory.
 *
 * Scans for files matching `dispatch-*.json` and `dispatch-*.json.lock`,
 * removing any whose mtime exceeds the retention period.
 *
 * This function is designed to be called fire-and-forget at startup.
 * It never throws — all errors are logged as warnings.
 *
 * @param stateDir  Absolute path to the state directory
 * @param retentionMs  How long to keep files (default: 7 days)
 * @returns Number of files removed
 */
export declare function cleanExpiredState(stateDir: string, retentionMs?: number): Promise<{
    removed: number;
}>;
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