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/phpdocumentor/guides/src/Event/PreRenderProcess.php

@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of phpDocumentor.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @link https://phpdoc.org
+ */
+
+namespace phpDocumentor\Guides\Event;
+
+use phpDocumentor\Guides\Handlers\RenderCommand;
+
+/**
+ * This event is called once before each rendering method after all documents have been parsed and
+ * all compiler passes (including node transformers have been called.)
+ *
+ * It can be used to exit the rendering process before anything was rendered. A third party extension could then
+ * take over the rendering with its own means.
+ */
+final class PreRenderProcess
+{
+    private bool $exitRendering = false;
+
+    public function __construct(
+        private readonly RenderCommand $command,
+        private readonly int $steps = 1,
+    ) {
+    }
+
+    public function getCommand(): RenderCommand
+    {
+        return $this->command;
+    }
+
+    public function isExitRendering(): bool
+    {
+        return $this->exitRendering;
+    }
+
+    public function setExitRendering(bool $exitRendering): PreRenderProcess
+    {
+        $this->exitRendering = $exitRendering;
+
+        return $this;
+    }
+
+    public function getSteps(): int
+    {
+        return $this->steps;
+    }
+}