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/config/Definition/Configurator/DefinitionConfigurator.php

@@ -0,0 +1,47 @@
+<?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\Config\Definition\Configurator;
+
+use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
+use Symfony\Component\Config\Definition\Builder\NodeDefinition;
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\Loader\DefinitionFileLoader;
+
+/**
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+class DefinitionConfigurator
+{
+    public function __construct(
+        private TreeBuilder $treeBuilder,
+        private DefinitionFileLoader $loader,
+        private string $path,
+        private string $file,
+    ) {
+    }
+
+    public function import(string $resource, ?string $type = null, bool $ignoreErrors = false): void
+    {
+        $this->loader->setCurrentDir(\dirname($this->path));
+        $this->loader->import($resource, $type, $ignoreErrors, $this->file);
+    }
+
+    public function rootNode(): NodeDefinition|ArrayNodeDefinition
+    {
+        return $this->treeBuilder->getRootNode();
+    }
+
+    public function setPathSeparator(string $separator): void
+    {
+        $this->treeBuilder->setPathSeparator($separator);
+    }
+}