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/Builder/ConfigBuilderGeneratorInterface.php

@@ -0,0 +1,27 @@
+<?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\Builder;
+
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+/**
+ * Generates ConfigBuilders to help create valid config.
+ *
+ * @author Tobias Nyholm <tobias.nyholm@gmail.com>
+ */
+interface ConfigBuilderGeneratorInterface
+{
+    /**
+     * @return \Closure that will return the root config class
+     */
+    public function build(ConfigurationInterface $configuration): \Closure;
+}