/**
 * System-reserved group IDs.
 * These groups are always present and cannot be renamed or deleted.
 * Membership within them is still fully manageable.
 */
export declare const SYSTEM_GROUP_IDS: {
    readonly FAVORITES: "system::favorites";
    readonly BLOCKED: "system::blocked";
};
export type SystemGroupId = (typeof SYSTEM_GROUP_IDS)[keyof typeof SYSTEM_GROUP_IDS];
/** Human-readable locked names for system groups */
export declare const SYSTEM_GROUP_NAMES: Record<SystemGroupId, string>;