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feat(build.mcpp): the rule-package specification, a portable check role, and modules/ for mcpp itself (2026.8.29.1) #159

Job	Run time
openkal e2e (the scripts, on a runner that has llvm)	6m 32s
build 3 targets on linux	4m 22s
build 3 targets on windows	6m 38s
build 3 targets on macos	2m 56s
run 3 builds on macos	8s
run 3 builds on linux	6s
run 3 builds on windows	7s
	20m 49s