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/Compiler/RemoveBuildParametersPass.php

@@ -0,0 +1,57 @@
+<?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\Compiler;
+
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+class RemoveBuildParametersPass implements CompilerPassInterface
+{
+    /**
+     * @var array<string, mixed>
+     */
+    private array $removedParameters = [];
+
+    public function __construct(
+        private bool $preserveArrays = false,
+    ) {
+    }
+
+    /**
+     * @return void
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $parameterBag = $container->getParameterBag();
+        $this->removedParameters = [];
+
+        foreach ($parameterBag->all() as $name => $value) {
+            if ('.' !== ($name[0] ?? '')) {
+                continue;
+            }
+            if (!$this->preserveArrays || !\is_array($value)) {
+                $this->removedParameters[$name] = $value;
+                $parameterBag->remove($name);
+                $container->log($this, \sprintf('Removing build parameter "%s".', $name));
+            } else {
+                $container->log($this, \sprintf('Keeping array build parameter "%s" for placeholder resolution.', $name));
+            }
+        }
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function getRemovedParameters(): array
+    {
+        return $this->removedParameters;
+    }
+}