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Sweep three registries, cover the WebRTC and platform backends, and raise the floor to 81 #128

Job	Run time
The X11 backend driving input on a real FreeBSD	1m 58s
stable-api (windows-2022, 3.14)	51s
What a real macOS runner permits	34s
stable-api (ubuntu-22.04, 3.14)	43s
stable-api (macos-14, 3.14)	41s
stable-api (ubuntu-22.04-arm, 3.14)	43s
stable-api (windows-2022, 3.10)	45s
stable-api (ubuntu-22.04, 3.10)	43s
stable-api (macos-14, 3.10)	46s
stable-api (ubuntu-22.04-arm, 3.10)	33s
stable-api (windows-11-arm, 3.14)	41s
	8m 58s