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/nikic/php-parser/lib/PhpParser/ParserFactory.php

@@ -0,0 +1,42 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser;
+
+use PhpParser\Parser\Php7;
+use PhpParser\Parser\Php8;
+
+class ParserFactory {
+    /**
+     * Create a parser targeting the given version on a best-effort basis. The parser will generally
+     * accept code for the newest supported version, but will try to accommodate code that becomes
+     * invalid in newer versions or changes in interpretation.
+     */
+    public function createForVersion(PhpVersion $version): Parser {
+        if ($version->isHostVersion()) {
+            $lexer = new Lexer();
+        } else {
+            $lexer = new Lexer\Emulative($version);
+        }
+        if ($version->id >= 80000) {
+            return new Php8($lexer, $version);
+        }
+        return new Php7($lexer, $version);
+    }
+
+    /**
+     * Create a parser targeting the newest version supported by this library. Code for older
+     * versions will be accepted if there have been no relevant backwards-compatibility breaks in
+     * PHP.
+     */
+    public function createForNewestSupportedVersion(): Parser {
+        return $this->createForVersion(PhpVersion::getNewestSupported());
+    }
+
+    /**
+     * Create a parser targeting the host PHP version, that is the PHP version we're currently
+     * running on. This parser will not use any token emulation.
+     */
+    public function createForHostVersion(): Parser {
+        return $this->createForVersion(PhpVersion::getHostVersion());
+    }
+}