/**
 * Extracted pass-through consumer for main-session event observation (AC-15).
 *
 * Delegates to the is-main-session observer factory and silently catches errors.
 * Best-effort isMainSession caching — never blocks canonical event handling.
 *
 * @param observer - The is-main-session observer function (sessionIsMainObserverFactory.observer from plugin.ts).
 * @returns An async function that receives { event } and forwards to the observer.
 */
export declare function createSessionMainConsumer(observer: (input: {
    event?: unknown;
}) => Promise<void>): (input: {
    event?: unknown;
}) => Promise<void>;
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