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/sebastian/object-reflector/src/Exception.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/object-reflector.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\ObjectReflector;
+
+use Throwable;
+
+interface Exception extends Throwable
+{
+}

vendor/sebastian/object-reflector/src/InvalidArgumentException.php

@@ -0,0 +1,14 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/object-reflector.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\ObjectReflector;
+
+class InvalidArgumentException extends \InvalidArgumentException implements Exception
+{
+}

vendor/sebastian/object-reflector/src/ObjectReflector.php

@@ -0,0 +1,51 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of sebastian/object-reflector.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\ObjectReflector;
+
+use function count;
+use function explode;
+use function get_class;
+use function is_object;
+
+class ObjectReflector
+{
+    /**
+     * @param object $object
+     *
+     * @throws InvalidArgumentException
+     */
+    public function getAttributes($object): array
+    {
+        if (!is_object($object)) {
+            throw new InvalidArgumentException;
+        }
+
+        $attributes = [];
+        $className  = get_class($object);
+
+        foreach ((array) $object as $name => $value) {
+            $name = explode("\0", (string) $name);
+
+            if (count($name) === 1) {
+                $name = $name[0];
+            } else {
+                if ($name[1] !== $className) {
+                    $name = $name[1] . '::' . $name[2];
+                } else {
+                    $name = $name[2];
+                }
+            }
+
+            $attributes[$name] = $value;
+        }
+
+        return $attributes;
+    }
+}