debug(v2): log WindowRenderer to check if windows mount

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/components/windows/WindowRenderer.tsx

@@ -20,11 +20,14 @@ interface Props {
 export const WindowRenderer: React.FC<Props> = ({ characters, chatMessages, nearbyObjects, socket }) => {
   const { windows } = useWindowManager();
 
+  console.log('[WR] Rendering', windows.length, 'windows:', windows.map(w => w.id));
+
   return (
     <>
       {windows.map(w => {
         const charName = w.charName ?? '';
         const prefix = w.id.split('-')[0];
+        console.log('[WR] Window:', w.id, 'prefix:', prefix, 'charName:', charName);
 
         switch (prefix) {
           case 'chat':