docs: record the post-release ecosystem verification and what it caug… #1039

Job	Run time
toolchain: gcc (cold self-host)	7m 29s
integration: mcpp builds & runs xlings	7m 40s
toolchain: musl + llvm	7m 39s
build + unit tests (linux x86_64, self-host)	10m 20s
	33m 8s

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