import type { SagaEvent } from '../coordinator/state.js';
/**
 * Append an event to the saga's events.jsonl.
 * This is the single source of truth for crash-resume arbitration (§2.1.1).
 */
export declare function appendEvent(stateRoot: string, sagaId: string, event: SagaEvent): Promise<void>;
/**
 * Read all events from events.jsonl.
 * Used for replay, crash-resume, and four-source arbitration.
 */
export declare function readEvents(stateRoot: string, sagaId: string): Promise<SagaEvent[]>;
/**
 * Read only the last event — used for four-source arbitration.
 */
export declare function readTailEvent(stateRoot: string, sagaId: string): Promise<SagaEvent | undefined>;
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