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2026.10.1.3: a source for every tool a build uses, declared, programmable and observable (#755) #2238

Job	Run time
toolchain: gcc (cold self-host)	13m 18s
build + unit tests (linux x86_64, self-host)	25m 18s
integration: mcpp builds & runs xlings	12m 28s
toolchain: musl + llvm	21m 32s
examples: the curriculum builds	13m 15s
	1h 25m 51s