Fix f-string backslash error in CONTEXT PREVIEW print by precomputing preview_clean

home/chezy/golem_flask_server.py

@@ -2192,7 +2192,8 @@ def generate():
             # Debug: show a short preview to verify real context is included
             preview = (context_result.get('context_text') or '')
             if preview:
-                print(f"🧠 CONTEXT PREVIEW: {preview[:180].replace('\n',' ')[:180]}...")
+                preview_clean = preview[:180].replace("\n", " ")[:180]
+                print(f"🧠 CONTEXT PREVIEW: {preview_clean}...")
         else:
             chat_history = get_chat_context(session_id)
             print("📝 Using standard context management")