import type { MemoryIndexEntry } from '../memory/memory-search-service.js';
/**
 * preflight ranks over.
 *
 * - `hot`  — standing rules / feedback / decisions. Always eligible.
 * - `warm` — project / reference memos. Injected only on task relevance.
 *
 * `cold` is deep storage and is deliberately NOT surfaced here.
 */
export interface MemoryTieredSelection {
    hot: MemoryIndexEntry[];
    warm: MemoryIndexEntry[];
}
export declare class MemoryIndexReader {
    private readonly projectRoot;
    private cache;
    constructor(projectRoot: string);
    /**
     * Flatten the whole index (all tiers, all buckets). Kept for
     * back-compat with the pre-2026-09-09 callers.
     */
    loadIfStale(): MemoryIndexEntry[];
    /**
     *
     * Returns `null` when `.peaks/memory/index.json` is absent or
     * unreadable — the caller distinguishes "no index" from "index with
     * zero entries" for its fail-soft reason code. Never throws.
     */
    selectTiered(): MemoryTieredSelection | null;
    selectFeedbackLayerA(cap: number): MemoryIndexEntry[];
    private loadSnapshot;
}