docs: three trees, three audiences, and the rule for citing between t… #1561

Job	Run time
windows→linux cross-build (windows host)	8m 50s
mingw-cross linux→windows (build + wine run)	7m 5s
cross-build aarch64-linux-musl (mcpp + xlings)	12m 33s
windows→linux artefact really runs (linux)	4s
	28m 32s

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