/**
 * Server PluginHost — singleton holding registered BackendModule manifests +
 * activation state. M13 spec: this is the *single* abstraction layer for
 * entity types. All consumers (chat-context, serializer registry, MCP, L4
 * routes) ask the host instead of iterating type literals.
 *
 * Phase 0: only registration + lookup. mountBackend is a stub that becomes
 * the unified mount point in Phase 3.
 */
import type { PluginHost } from './types.js';
export declare const pluginHost: PluginHost;
