/**
 * Memory index store abstraction (Phase 2): the operational index over durable memory
 * refs (Pi OKF and, later, external providers), so retrieval can rank/filter without
 * re-querying every source on every turn. This is an index/cache layer per
 * memory-architecture.md, not the durable memory itself; the OKF bundle (or a provider)
 * remains canonical for the underlying content.
 *
 * This module does not hardcode Automata or any specific provider: `ContextMemoryRef`
 * already carries an opaque `providerId`, and nothing here special-cases a provider name.
 * No external provider queries or writes happen here — this is metadata indexing only.
 */
import type { ContextMemoryRef, MemoryScope } from "./context-item.ts";
export interface MemoryIndexRecord {
    ref: ContextMemoryRef;
    title?: string;
    summary: string;
    indexedAtTurn: number;
    stale: boolean;
}
export interface MemoryIndexStore {
    upsert(record: MemoryIndexRecord): void;
    get(providerId: string, itemId: string): MemoryIndexRecord | undefined;
    list(scope?: MemoryScope): MemoryIndexRecord[];
    markStale(providerId: string, itemId: string): void;
    remove(providerId: string, itemId: string): void;
}
export declare function createInMemoryMemoryIndexStore(): MemoryIndexStore;
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