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feat(subagent): thread explicit parent effort to workers #3582

Job	Run time
build	11s
test (3/4)	48s
test (2/4)	47s
static-analysis	49s
test (1/4)	44s
test (4/4)	35s
test (one-process pollution detector)	-1s
typecheck	4s
prettier	3s
eslint	3s
build-and-test	3s
test (src)	3s
	4m 9s