Remove gradio from requirements - already installed on HF Spaces

requirements.txt

@@ -1,8 +1,8 @@
-# Required for HF Space display
-gradio>=4.0.0
+# HF Spaces already has gradio and huggingface_hub pre-installed
+# Do not add them here or you may get version conflicts
 
 # Agent dependencies (these are provided by the evaluation infrastructure)
-# Do not add jericho, fastmcp, or huggingface_hub here - they are already installed
+# Do not add jericho, fastmcp here - they are installed during evaluation
 
 # Add any additional packages your agent needs below:
 # numpy