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/PhpDumper/NullDumper.php

@@ -0,0 +1,39 @@
+<?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\PhpDumper;
+
+use Symfony\Component\DependencyInjection\Definition;
+
+/**
+ * Null dumper, negates any proxy code generation for any given service definition.
+ *
+ * @author Marco Pivetta <ocramius@gmail.com>
+ *
+ * @final
+ */
+class NullDumper implements DumperInterface
+{
+    public function isProxyCandidate(Definition $definition, ?bool &$asGhostObject = null, ?string $id = null): bool
+    {
+        return $asGhostObject = false;
+    }
+
+    public function getProxyFactoryCode(Definition $definition, string $id, string $factoryCode): string
+    {
+        return '';
+    }
+
+    public function getProxyCode(Definition $definition, ?string $id = null): string
+    {
+        return '';
+    }
+}