feat: add client rule registry

plugin/index.ts

@@ -31,6 +31,13 @@ export {
   type YonexusClientRuntimeState,
   type YonexusClientPhase
 } from "./core/runtime.js";
+export {
+  createClientRuleRegistry,
+  YonexusClientRuleRegistry,
+  ClientRuleRegistryError,
+  type ClientRuleRegistry,
+  type ClientRuleProcessor
+} from "./core/rules.js";
 
 export interface YonexusClientPluginManifest {
   readonly name: "Yonexus.Client";