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design 2026-10-28 (platforms, part 2): landed #721

Job	Run time
what the change starts	8s
documentation and repository checks	25s
build-linux-arm	0s
bootstrap	0s
build-macos	0s
build-linux	0s
linux	-1s
build-windows	-1s
target-matrix	-1s
macos	-1s
cross	-1s
linux-e2e	-1s
macos-e2e	-1s
windows-msvc-xlings	-1s
macos-ios	-1s
windows-e2e	-1s
openkal	-1s
windows	-1s
upgrade	-1s
every e2e test runs somewhere	0s
	20s