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mcpp 2026.9.27.1: #704-#716, feature tools, artifacts, payload revision, prepare.cppm decomposition #2128

Job	Run time
toolchain: gcc (cold self-host)	12m 37s
examples: the curriculum builds	11m 30s
build + unit tests (linux x86_64, self-host)	12m 36s
toolchain: musl + llvm	12m 39s
integration: mcpp builds & runs xlings	11m 51s
	1h 1m 13s