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/Helper/HelperInterface.php

@@ -0,0 +1,39 @@
+<?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\Helper;
+
+/**
+ * HelperInterface is the interface all helpers must implement.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface HelperInterface
+{
+    /**
+     * Sets the helper set associated with this helper.
+     *
+     * @return void
+     */
+    public function setHelperSet(?HelperSet $helperSet);
+
+    /**
+     * Gets the helper set associated with this helper.
+     */
+    public function getHelperSet(): ?HelperSet;
+
+    /**
+     * Returns the canonical name of this helper.
+     *
+     * @return string
+     */
+    public function getName();
+}