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/phpstan/phpdoc-parser/src/Ast/Node.php

@@ -0,0 +1,22 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\PhpDocParser\Ast;
+
+interface Node
+{
+
+	public function __toString(): string;
+
+	/**
+	 * @param mixed $value
+	 */
+	public function setAttribute(string $key, $value): void;
+
+	public function hasAttribute(string $key): bool;
+
+	/**
+	 * @return mixed
+	 */
+	public function getAttribute(string $key);
+
+}