export interface RuntimeSessionInfo {
    sid: string;
    mtimeMs: number;
    ageHours: number;
}
export interface CleanupOptions {
    olderThanHours: number;
    graceHours: number;
}
export interface CleanupResult {
    deleted: string[];
    skipped: {
        sid: string;
        reason: string;
    }[];
}
export declare function runtimeDirPath(projectRoot: string): string;
export declare function listRuntimeSessions(projectRoot: string): RuntimeSessionInfo[];
export declare function planRuntimeCleanup(sessions: RuntimeSessionInfo[], options: CleanupOptions): {
    eligible: string[];
    skipped: {
        sid: string;
        reason: string;
    }[];
};
export declare function executeRuntimeCleanup(projectRoot: string, options: CleanupOptions & {
    apply: boolean;
}): CleanupResult;