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docs(design): #636 landed; bootstrap pin 2026.9.15.1 (released, mirro… #1959

Job	Run time
toolchain: gcc (cold self-host)	9m 6s
examples: the curriculum builds	7m 42s
integration: mcpp builds & runs xlings	10m 12s
build + unit tests (linux x86_64, self-host)	17m 59s
toolchain: musl + llvm	11m 9s
	56m 8s