/**
 * Handles `session.idle` — updates the session status to "completed".
 *
 * REQ-C6-01: Extracted from EventCapture god module. This handler
 * processes session.idle events for both child and main sessions.
 *
 * Child sessions: routes through childWriter + sessionIndexWriter.
 * Main sessions: completes session, captures lastMessage.
 *
 * @module session-tracker/capture/handlers/session-idle-handler
 */
import type { HandlerDeps } from "./types.js";
export declare class SessionIdleHandler {
    private deps;
    constructor(deps: HandlerDeps);
    handle(sessionID: string): Promise<void>;
    /**
     * Records a trajectory completion event for a child session.
     * Best-effort: failures are logged but do not break session.idle handling.
     *
     * @param sessionID - The child session ID that completed.
     */
    private recordTrajectoryCompletion;
}
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