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mcpp 2026.9.27.1: #704-#716, feature tools, artifacts, payload revision, prepare.cppm decomposition #2126

Job	Run time
build + unit tests (linux x86_64, self-host)	18m 40s
integration: mcpp builds & runs xlings	10m 43s
toolchain: gcc (cold self-host)	12m 17s
examples: the curriculum builds	9m 48s
toolchain: musl + llvm	15m 53s
	1h 7m 21s