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mcpp 2026.9.27.1: #704-#716, feature tools, artifacts, payload revision, prepare.cppm decomposition #2129

Job	Run time
build + unit tests (linux x86_64, self-host)	13m 58s
toolchain: gcc (cold self-host)	13m 19s
examples: the curriculum builds	9m 52s
integration: mcpp builds & runs xlings	10m 47s
toolchain: musl + llvm	16m 35s
	1h 4m 31s