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mcpp 2026.9.27.1: #704-#716, feature tools, artifacts, payload revision, prepare.cppm decomposition #2124

Job	Run time
toolchain: gcc (cold self-host)	12m 20s
examples: the curriculum builds	8m 30s
toolchain: musl + llvm	14m 55s
integration: mcpp builds & runs xlings	10m 39s
build + unit tests (linux x86_64, self-host)	18m 31s
	1h 4m 55s