refactor: Cleanup git state - commit all staged changes

Major refactoring cleanup:
- Add new controller architecture (class-controller-*.php)
- Add new settings-v2 UI (views/settings-v2/)
- Add new CSS architecture (agentic-sidebar.css, tokens)
- Add esbuild build pipeline (scripts/build.js, package.json)
- Add composer dependencies (vendor/)
- Add frontend src directory (assets/js/src/index.jsx)
- Add documentation files
- Remove old/obsolete files (class-settings.php, old CSS)

This commits all pending changes from previous refactoring efforts.

vendor/symfony/dependency-injection/LazyProxy/Instantiator/RealServiceInstantiator.php

@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\LazyProxy\Instantiator;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\DependencyInjection\Definition;
+
+/**
+ * Noop proxy instantiator - produces the real service instead of a proxy instance.
+ *
+ * @author Marco Pivetta <ocramius@gmail.com>
+ */
+class RealServiceInstantiator implements InstantiatorInterface
+{
+    public function instantiateProxy(ContainerInterface $container, Definition $definition, string $id, callable $realInstantiator): object
+    {
+        return $realInstantiator();
+    }
+}