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/Builder/ValidationBuilder.php

@@ -0,0 +1,44 @@
+<?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\Builder;
+
+/**
+ * This class builds validation conditions.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class ValidationBuilder
+{
+    protected $node;
+    public $rules = [];
+
+    public function __construct(NodeDefinition $node)
+    {
+        $this->node = $node;
+    }
+
+    /**
+     * Registers a closure to run as normalization or an expression builder to build it if null is provided.
+     *
+     * @return ExprBuilder|$this
+     */
+    public function rule(?\Closure $closure = null): ExprBuilder|static
+    {
+        if (null !== $closure) {
+            $this->rules[] = $closure;
+
+            return $this;
+        }
+
+        return $this->rules[] = new ExprBuilder($this->node);
+    }
+}