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/Node/Name/Relative.php

@@ -0,0 +1,49 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Name;
+
+class Relative extends \PhpParser\Node\Name {
+    /**
+     * Checks whether the name is unqualified. (E.g. Name)
+     *
+     * @return bool Whether the name is unqualified
+     */
+    public function isUnqualified(): bool {
+        return false;
+    }
+
+    /**
+     * Checks whether the name is qualified. (E.g. Name\Name)
+     *
+     * @return bool Whether the name is qualified
+     */
+    public function isQualified(): bool {
+        return false;
+    }
+
+    /**
+     * Checks whether the name is fully qualified. (E.g. \Name)
+     *
+     * @return bool Whether the name is fully qualified
+     */
+    public function isFullyQualified(): bool {
+        return false;
+    }
+
+    /**
+     * Checks whether the name is explicitly relative to the current namespace. (E.g. namespace\Name)
+     *
+     * @return bool Whether the name is relative
+     */
+    public function isRelative(): bool {
+        return true;
+    }
+
+    public function toCodeString(): string {
+        return 'namespace\\' . $this->toString();
+    }
+
+    public function getType(): string {
+        return 'Name_Relative';
+    }
+}