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/contracts/Tests/Service/LegacyTestService.php

@@ -0,0 +1,105 @@
+<?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\Contracts\Tests\Service;
+
+use Psr\Container\ContainerInterface;
+use Symfony\Contracts\Service\Attribute\Required;
+use Symfony\Contracts\Service\Attribute\SubscribedService;
+use Symfony\Contracts\Service\ServiceSubscriberInterface;
+use Symfony\Contracts\Service\ServiceSubscriberTrait;
+
+class LegacyParentTestService
+{
+    public function aParentService(): Service1
+    {
+    }
+
+    public function setContainer(ContainerInterface $container): ?ContainerInterface
+    {
+        return $container;
+    }
+}
+
+class LegacyTestService extends LegacyParentTestService implements ServiceSubscriberInterface
+{
+    use ServiceSubscriberTrait;
+
+    protected $container;
+
+    #[SubscribedService]
+    public function aService(): Service2
+    {
+        return $this->container->get(__METHOD__);
+    }
+
+    #[SubscribedService(nullable: true)]
+    public function nullableInAttribute(): Service2
+    {
+        if (!$this->container->has(__METHOD__)) {
+            throw new \LogicException();
+        }
+
+        return $this->container->get(__METHOD__);
+    }
+
+    #[SubscribedService]
+    public function nullableReturnType(): ?Service2
+    {
+        return $this->container->get(__METHOD__);
+    }
+
+    #[SubscribedService(attributes: new Required())]
+    public function withAttribute(): ?Service2
+    {
+        return $this->container->get(__METHOD__);
+    }
+}
+
+class LegacyChildTestService extends LegacyTestService
+{
+    #[SubscribedService]
+    public function aChildService(): LegacyService3
+    {
+        return $this->container->get(__METHOD__);
+    }
+}
+
+class LegacyParentWithMagicCall
+{
+    public function __call($method, $args)
+    {
+        throw new \BadMethodCallException('Should not be called.');
+    }
+
+    public static function __callStatic($method, $args)
+    {
+        throw new \BadMethodCallException('Should not be called.');
+    }
+}
+
+class LegacyService3
+{
+}
+
+class LegacyParentTestService2
+{
+    /** @var ContainerInterface */
+    protected $container;
+
+    public function setContainer(ContainerInterface $container)
+    {
+        $previous = $this->container ?? null;
+        $this->container = $container;
+
+        return $previous;
+    }
+}