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/Exception/RunCommandFailedException.php

@@ -0,0 +1,29 @@
+<?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\Exception;
+
+use Symfony\Component\Console\Messenger\RunCommandContext;
+
+/**
+ * @author Kevin Bond <kevinbond@gmail.com>
+ */
+final class RunCommandFailedException extends RuntimeException
+{
+    public function __construct(\Throwable|string $exception, public readonly RunCommandContext $context)
+    {
+        parent::__construct(
+            $exception instanceof \Throwable ? $exception->getMessage() : $exception,
+            $exception instanceof \Throwable && \is_int($exception->getCode()) ? $exception->getCode() : 0,
+            $exception instanceof \Throwable ? $exception : null,
+        );
+    }
+}