Fix HF Space stuck on "Starting": disable Gradio experimental SSR

gradio 5.49 auto-enables SSR on HF Spaces (Node present); HF's readiness check
goes through the experimental SSR layer and never passes, so the Space hangs on
"Starting" even though the app binds 7860 and serves. Default ssr_mode off in
launch() (overridable via kwargs / GRADIO_SSR_MODE).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

gradio_ui.py

@@ -1081,4 +1081,8 @@ class GradioAgentUI(_UIFormattingMixin):
         kwargs.setdefault('server_name', '0.0.0.0')
         kwargs.setdefault('server_port', 7860)
         kwargs.setdefault('show_error', True)
+        # Disable Gradio 5.x experimental SSR: on HF Spaces it auto-enables (Node
+        # present) and the readiness check hangs the Space on "Starting" forever
+        # even though the app binds 7860. Overridable via kwargs / GRADIO_SSR_MODE.
+        kwargs.setdefault('ssr_mode', False)
         app.queue(max_size=10).launch(share=share, show_api=False, favicon_path=None, **kwargs)