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docs(plan): §13 — released, and verified against the released form #1477

Job	Run time
toolchain: gcc (cold self-host)	10m 18s
toolchain: musl + llvm	9m 33s
build + unit tests (linux x86_64, self-host)	15m 16s
integration: mcpp builds & runs xlings	7m 44s
	42m 51s