/**
 * StoreRegistry — persistent multi-store registry backed by stores.json
 *
 * Implements knowledge-graph-plans.md Phase 2:
 * - Persistent store registry file (`stores.json`)
 * - Store discovery, registration, and lookup by storeId
 * - Thread-safe read/write with atomic file operations
 *
 * The registry lives at `<config-dir>/stores.json` where config-dir
 * defaults to the server's CWD. Each entry maps a storeId to its
 * filesystem path and metadata.
 */
export interface StoreRegistryEntry {
    /** Stable identifier (e.g., "my-project", "default") */
    storeId: string;
    /** Absolute path to the project root containing a memory-bank/ folder */
    projectPath: string;
    /** Kind of store */
    kind: 'local' | 'remote';
    /** ISO timestamp of last access */
    lastUsedAt: string;
    /** ISO timestamp of registration */
    registeredAt: string;
}
export interface StoreRegistryFile {
    /** Schema version for forward compat */
    version: 1;
    /** Currently selected storeId (null = use default) */
    selectedStoreId: string | null;
    /** Registered stores */
    stores: StoreRegistryEntry[];
}
export declare class StoreRegistry {
    private readonly registryPath;
    private cache;
    /**
     * @param configDir Directory where stores.json will be stored (default: CWD)
     */
    constructor(configDir?: string);
    /** Load the registry from disk (cached after first load within a session). */
    load(): Promise<StoreRegistryFile>;
    /** Get all registered stores. */
    listStores(): Promise<StoreRegistryEntry[]>;
    /** Get a store by its storeId. Returns null if not found. */
    getStore(storeId: string): Promise<StoreRegistryEntry | null>;
    /** Get the currently selected storeId. */
    getSelectedStoreId(): Promise<string | null>;
    /** Resolve a storeId to its project path. Returns null if not registered. */
    resolveStorePath(storeId: string): Promise<string | null>;
    /**
     * Register or update a store in the registry.
     * Upserts by storeId — if the storeId already exists, updates its fields.
     */
    registerStore(entry: Omit<StoreRegistryEntry, 'registeredAt' | 'lastUsedAt'>): Promise<StoreRegistryEntry>;
    /** Remove a store from the registry by storeId. */
    unregisterStore(storeId: string): Promise<boolean>;
    /** Set the selected store. Pass null to clear selection (use default). */
    selectStore(storeId: string | null): Promise<void>;
    /** Touch a store's lastUsedAt timestamp. */
    touchStore(storeId: string): Promise<void>;
    /** Invalidate the in-memory cache (forces re-read on next access). */
    invalidateCache(): void;
    /** Write the registry to disk and update cache. */
    private save;
}
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