Add getRegisteredPlugins, plugin manager panel in test app

dist/PluginRegistry.d.ts

@@ -114,6 +114,19 @@ export declare class PluginRegistry {
     clearLogs(pluginId?: string): void;
     /** Get the public exports of a loaded plugin. */
     getPluginExports(pluginId: string): unknown;
+    /**
+     * Returns metadata for all currently registered plugins.
+     * Useful for displaying a plugin directory / manager UI.
+     */
+    getRegisteredPlugins(): Array<{
+        id: string;
+        name: string;
+        version: string;
+        commandCount: number;
+        interceptorCount: number;
+        themeCount: number;
+        hasSettings: boolean;
+    }>;
     /** Unload the current plugin instance and load a new one in-place. */
     reloadPlugin(pluginId: string, newPlugin: Plugin, newContext: PluginContext): Promise<void>;
     /** Unload all plugins and clear all registry state. */