The firefox-10 build gated green on all 5 targets but both macOS gate legs
failed. The cloak/webgl guards hard-required a live WebGL context, and macOS
GitHub runners expose none in the CI session (no software-GL fallback, unlike
Linux llvmpipe and Windows WARP). The cloak renders fine there anyway, which the
non-blank screenshot proves, so on the mac legs the WebGL-present check now
self-skips and the cocoa cloak is validated via the screenshot plus CGWindowAlpha.
The gamma masking guard skips on mac too (platform-agnostic C++, covered on Linux
and Windows).
verify-cloak.yml re-runs these guards against a prior build run's artifacts with
no rebuild, so a test-only fix like this is validated against the real binaries
in minutes instead of a 3h rebuild.
feder-cr
a950537f0a