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/var-exporter/LazyObjectInterface.php

@@ -0,0 +1,32 @@
+<?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\VarExporter;
+
+interface LazyObjectInterface
+{
+    /**
+     * Returns whether the object is initialized.
+     *
+     * @param bool $partial Whether partially initialized objects should be considered as initialized
+     */
+    public function isLazyObjectInitialized(bool $partial = false): bool;
+
+    /**
+     * Forces initialization of a lazy object and returns it.
+     */
+    public function initializeLazyObject(): object;
+
+    /**
+     * @return bool Returns false when the object cannot be reset, ie when it's not a lazy object
+     */
+    public function resetLazyObject(): bool;
+}