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feat(accel): exclusive capabilities, an open accel grammar, and the deprecated environment key removed from the manual #285

Job	Run time
openkal e2e (the scripts, on a runner that has llvm)	9m 9s
build 3 targets on macos	3m 40s
build 3 targets on windows	5m 28s
build 3 targets on linux	6m 26s
run 3 builds on macos	9s
run 3 builds on linux	5s
run 3 builds on windows	5s
	25m 2s