suppress asyncio cleanup warnings from DDGS library

The DuckDuckGo search library creates asyncio event loops that
produce harmless cleanup warnings. Added warnings filter and
simplified DDGS usage.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -3,6 +3,7 @@ import time
 import gc
 import sys
 import threading
+import warnings
 from itertools import islice
 from datetime import datetime
 import re  # for parsing <think> blocks
@@ -16,6 +17,9 @@ from torch.utils._pytree import tree_map
 import numpy as np
 from pocket_tts import TTSModel
 
+# Suppress asyncio event loop cleanup warnings (harmless, from DDGS library)
+warnings.filterwarnings("ignore", message=".*Invalid file descriptor.*")
+
 # Global event to signal cancellation from the UI thread to the generation thread
 cancel_event = threading.Event()
 
@@ -440,9 +444,10 @@ def retrieve_context(query, max_results=6, max_chars=50):
     Returns a list of result strings.
     """
     try:
-        with DDGS() as ddgs:
-            return [f"{i+1}. {r.get('title','No Title')} - {r.get('body','')[:max_chars]}"
-                    for i, r in enumerate(islice(ddgs.text(query, region="wt-wt", safesearch="off", timelimit="y"), max_results))]
+        ddgs = DDGS()
+        results = list(islice(ddgs.text(query, region="wt-wt", safesearch="off", timelimit="y"), max_results))
+        return [f"{i+1}. {r.get('title','No Title')} - {r.get('body','')[:max_chars]}"
+                for i, r in enumerate(results)]
     except Exception:
         return []