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2026.9.8.1: a package's host modules are ordered by what they import, and the design document aligned with what shipped #1768

Job	Run time
examples: the curriculum builds	8m 4s
toolchain: musl + llvm	9m 7s
build + unit tests (linux x86_64, self-host)	17m 8s
integration: mcpp builds & runs xlings	7m 52s
toolchain: gcc (cold self-host)	10m 5s
	52m 16s