import type { AgentSession } from '../model/agent-session.type.js';
import type { SessionChanges } from '../model/session-changes.type.js';
/**
 * @purpose Compare two AgentSession snapshots and produce added, removed, updated change categories.
 * @param prev Previous snapshot of sessions — may be empty.
 * @param curr Current snapshot of sessions — may be empty.
 * @returns SessionChanges with sessions partitioned by change type (all arrays may be empty).
 */
export declare function diff(prev: AgentSession[], curr: AgentSession[]): SessionChanges;