Fix: context-manager import error - use QwenOAuth class correctly

lib/context-manager.mjs

@@ -5,7 +5,7 @@
  * Original implementation for OpenQode TUI
  */
 
-import { getQwen } from '../qwen-oauth.mjs';
+import { QwenOAuth } from '../qwen-oauth.mjs';
 
 // Rough token estimation: ~4 chars per token for English
 const CHARS_PER_TOKEN = 4;
@@ -96,7 +96,7 @@ SUMMARY:`;
 
         try {
             // Use AI to generate summary
-            const oauth = getQwen();
+            const oauth = new QwenOAuth();
             const result = await oauth.sendMessage(summaryPrompt, 'qwen-turbo');
 
             if (result.success) {