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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 #1762

Job	Run time
integration: mcpp builds & runs xlings	6m 55s
toolchain: gcc (cold self-host)	6m 55s
build + unit tests (linux x86_64, self-host)	6m 56s
toolchain: musl + llvm	6m 55s
examples: the curriculum builds	6m 53s
	34m 34s