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/Completion/Suggestion.php

@@ -0,0 +1,41 @@
+<?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\Completion;
+
+/**
+ * Represents a single suggested value.
+ *
+ * @author Wouter de Jong <wouter@wouterj.nl>
+ */
+class Suggestion implements \Stringable
+{
+    public function __construct(
+        private readonly string $value,
+        private readonly string $description = '',
+    ) {
+    }
+
+    public function getValue(): string
+    {
+        return $this->value;
+    }
+
+    public function getDescription(): string
+    {
+        return $this->description;
+    }
+
+    public function __toString(): string
+    {
+        return $this->getValue();
+    }
+}