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feat(compat): the farm carries only what its runtime can reach, and a moved pin is carried down the chain #1176

Job	Run time
select	12s
lint	20s
graphics install: no side effects on unrelated members	3m 14s
mirror-cn-reachable	29s
workspace (linux llvm 3/4)	43s
workspace (linux llvm 2/4)	43s
workspace (windows default 0/1)	8m 17s
workspace (linux default 0/1)	13m 31s
workspace (macos default 0/1)	6m 7s
workspace (linux llvm 0/4)	20m 34s
workspace (linux llvm 1/4)	47s
timings	5s
full sweep failed — open an issue	-1s
	55m 1s