/**
 * Settings store — read-write facade around `host.config.json` for the
 * /api/settings route.
 *
 * The installer (`6.4.1`) owns the schema (`HostConfigFile` v3). This module
 * just delegates load/persist to that file's helpers; it exists so route
 * handlers can read/write without each one re-resolving `configPath(dataDir)`.
 *
 * PUT semantics live in routes/settings.ts; this class is purely an I/O
 * boundary so tests can swap it for an in-memory fake.
 */
import { type HostConfigFile } from '../installer/config.js';
export interface HostSettingsStoreOptions {
    /** Resolved cadre-host data dir. */
    dataDir: string;
}
export declare class HostSettingsStore {
    private readonly configPath;
    constructor(opts: HostSettingsStoreOptions);
    /** Read the current host.config.json. Throws if absent, malformed, or not version 3. */
    read(): HostConfigFile;
    /** Patch and persist. */
    update(patch: Partial<Omit<HostConfigFile, 'version'>>): HostConfigFile;
}