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/console/Messenger/RunCommandMessageHandler.php

@@ -0,0 +1,52 @@
+<?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\Console\Messenger;
+
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Exception\RunCommandFailedException;
+use Symfony\Component\Console\Input\StringInput;
+use Symfony\Component\Console\Output\BufferedOutput;
+use Symfony\Component\Messenger\Exception\RecoverableExceptionInterface;
+use Symfony\Component\Messenger\Exception\UnrecoverableExceptionInterface;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+final class RunCommandMessageHandler
+{
+    public function __construct(private readonly Application $application)
+    {
+    }
+
+    public function __invoke(RunCommandMessage $message): RunCommandContext
+    {
+        $input = new StringInput($message->input);
+        $output = new BufferedOutput();
+
+        $this->application->setCatchExceptions($message->catchExceptions);
+
+        try {
+            $exitCode = $this->application->run($input, $output);
+        } catch (UnrecoverableExceptionInterface|RecoverableExceptionInterface $e) {
+            throw $e;
+        } catch (\Throwable $e) {
+            throw new RunCommandFailedException($e, new RunCommandContext($message, Command::FAILURE, $output->fetch()));
+        }
+
+        if ($message->throwOnFailure && Command::SUCCESS !== $exitCode) {
+            throw new RunCommandFailedException(\sprintf('Command "%s" exited with code "%s".', $message->input, $exitCode), new RunCommandContext($message, $exitCode, $output->fetch()));
+        }
+
+        return new RunCommandContext($message, $exitCode, $output->fetch());
+    }
+}