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/dependency-injection/Argument/BoundArgument.php

@@ -0,0 +1,56 @@
+<?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\DependencyInjection\Argument;
+
+/**
+ * @author Guilhem Niot <guilhem.niot@gmail.com>
+ */
+final class BoundArgument implements ArgumentInterface
+{
+    public const SERVICE_BINDING = 0;
+    public const DEFAULTS_BINDING = 1;
+    public const INSTANCEOF_BINDING = 2;
+
+    private static int $sequence = 0;
+
+    private mixed $value;
+    private ?int $identifier = null;
+    private ?bool $used = null;
+    private int $type;
+    private ?string $file;
+
+    public function __construct(mixed $value, bool $trackUsage = true, int $type = 0, ?string $file = null)
+    {
+        $this->value = $value;
+        if ($trackUsage) {
+            $this->identifier = ++self::$sequence;
+        } else {
+            $this->used = true;
+        }
+        $this->type = $type;
+        $this->file = $file;
+    }
+
+    public function getValues(): array
+    {
+        return [$this->value, $this->identifier, $this->used, $this->type, $this->file];
+    }
+
+    public function setValues(array $values): void
+    {
+        if (5 === \count($values)) {
+            [$this->value, $this->identifier, $this->used, $this->type, $this->file] = $values;
+        } else {
+            [$this->value, $this->identifier, $this->used] = $values;
+        }
+    }
+}