McpEvents class

Public entry point for the mcpe2e system.

Exposes system operations as a simple API without requiring the caller to know about the Registry, Simulator, or Executor internally.

Typical usage in the app:

// 1. Register widgets before mounting them
McpEvents.instance.registerWidget(const McpMetadataKey(
  id: 'auth.login_button',
  widgetType: McpWidgetType.button,
  description: 'Main login button',
  screen: 'LoginScreen',
));

// 2. Use the key in the widget
ElevatedButton(
  key: McpEvents.instance.getGlobalKey('auth.login_button'),
  onPressed: _handleLogin,
  child: const Text('Sign in'),
)

// 3. Start the server (in main() or in a debug initState)
if (kDebugMode) await McpEventServer.start();