feat: register OAuth MCP server with direct tools

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01At3V6SjwbMe6eMzVGW3Hs7

src/Plugin.php

@@ -4,6 +4,12 @@ declare(strict_types=1);
 
 namespace LIT\MCP;
 
+use LIT\MCP\Abilities\AbilityRegistrar;
+use LIT\MCP\Guides\InstructionsBuilder;
+use LIT\MCP\Integrations\Core\CoreIntegration;
+use LIT\MCP\Integrations\IntegrationRegistry;
+use LIT\MCP\Server\ServerRegistrar;
+
 /**
  * Wires WP-LIT-MCP into WordPress.
  */
@@ -22,6 +28,15 @@ final class Plugin
         }
 
         (new Access())->register();
+
+        $registry = new IntegrationRegistry(
+            new CoreIntegration(self::pluginDir() . '/docs/guides')
+        );
+
+        (new AbilityRegistrar($registry))->register();
+        (new ServerRegistrar($registry, new InstructionsBuilder($registry)))->register();
+
+        \WPMedia\MCP\OAuth\Bootstrap::instance();
     }
 
     public static function pluginDir(): string