/**
 * [WHO]: Provides SessionLifecycleController — session identity-change choreography
 * [FROM]: Depends on agent-core (ThinkingLevel), extensions-host session hook result types,
 *         session-manager (SessionManager type), and ./session-context
 * [TO]: Consumed by core/runtime/agent-session.ts (constructs one, delegates newSession()/switchSession()/fork())
 * [HERE]: core/runtime/agent-session.ts split (AS08) — session identity transitions
 *
 * Extracted from AgentSession (AS08/AS11). Owns the new/switch/fork choreography: before/after extension
 * hooks, agent disconnect/abort/reset, pending-queue clearing, session-manager transition, message
 * rebuild, and (on resume) model/thinking restoration delegated through the context to
 * ModelController. Behavior is identical to the former AgentSession methods.
 */
import type { SessionManager } from "../session/session-manager.js";
import type { SessionLifecycleControllerContext } from "./session-context.js";
export interface NewSessionOptions {
    parentSession?: string;
    setup?: (sessionManager: SessionManager) => Promise<void>;
}
export interface ForkResult {
    selectedText: string;
    cancelled: boolean;
}
export declare class SessionLifecycleController {
    private readonly ctx;
    constructor(ctx: SessionLifecycleControllerContext);
    /**
     * Start a new session, optionally with initial messages and parent tracking.
     * Listeners are preserved and continue receiving events.
     * @returns true if completed, false if cancelled by an extension
     */
    newSession(options?: NewSessionOptions): Promise<boolean>;
    /**
     * Resume an existing session file: restore messages, model, and thinking level.
     * @returns true if completed, false if cancelled by an extension
     */
    switchSession(sessionPath: string): Promise<boolean>;
    /**
     * Create a new session identity from a user-message branch point.
     * @returns selected user text plus cancellation state
     */
    fork(entryId: string): Promise<ForkResult>;
}