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feat(compaction): fold to a token-capped tail, not recent turns #3002

Job	Run time
static-analysis	33s
build	11s
test (2/4)	35s
test (3/4)	1m 22s
test (4/4)	37s
test (1/4)	1m 5s
test (one-process pollution detector)	0s
typecheck	2s
eslint	2s
prettier	2s
build-and-test	3s
test (src)	2s
	4m 34s