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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 #1765

Job	Run time
toolchain: musl + llvm	2m 15s
integration: mcpp builds & runs xlings	2m 16s
toolchain: gcc (cold self-host)	2m 6s
examples: the curriculum builds	2m 2s
build + unit tests (linux x86_64, self-host)	2m 2s
	10m 41s