/**
 * Initial-state snapshot for a single page load. Collected once after
 * `hello.ack` and emitted as the first event of the load.
 *
 * Caps:
 *  - Single value: 32 KB → truncated with a placeholder
 *  - Entire snapshot: 256 KB → marked truncated, late keys dropped
 *
 * No business code is modified by this helper.
 */
import type { PageLoadPayload } from '@harnessa-fe/protocol';
export declare function collectPageLoadSnapshot(sessionId: string): PageLoadPayload;