Remove custom_headers to allow iframe embedding

- Custom COOP/COEP headers were blocking iframe embedding
- Service worker now handles headers client-side conditionally
- Direct access: SharedArrayBuffer enabled (AI multi-threaded)
- Iframe embed: No headers, AI uses single-threaded mode

README.md

@@ -7,10 +7,10 @@ sdk: docker
 pinned: false
 license: apache-2.0
 short_description: A web game of 3D Go (围棋)
-custom_headers:
-  cross-origin-embedder-policy: require-corp
-  cross-origin-opener-policy: same-origin
-  cross-origin-resource-policy: cross-origin
+# Note: custom_headers removed to allow iframe embedding on huggingface.co/spaces
+# The coi-serviceworker.js handles COOP/COEP headers client-side:
+# - Direct access: Service worker adds headers → SharedArrayBuffer enabled (AI multi-threaded)
+# - Iframe embed: Service worker not registered → No headers → AI single-threaded mode
 ---
 
 Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference