feat: scaffold yonexus client plugin

plugin/index.ts

@@ -0,0 +1,28 @@
+export interface YonexusClientPluginManifest {
+  readonly name: "Yonexus.Client";
+  readonly version: string;
+  readonly description: string;
+}
+
+export interface YonexusClientPluginRuntime {
+  readonly hooks: readonly [];
+  readonly commands: readonly [];
+  readonly tools: readonly [];
+}
+
+const manifest: YonexusClientPluginManifest = {
+  name: "Yonexus.Client",
+  version: "0.1.0",
+  description: "Yonexus client plugin for cross-instance OpenClaw communication"
+};
+
+export function createYonexusClientPlugin(): YonexusClientPluginRuntime {
+  return {
+    hooks: [],
+    commands: [],
+    tools: []
+  };
+}
+
+export default createYonexusClientPlugin;
+export { manifest };