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perf(subagent): reuse parent setup across spawns #3131

Job	Run time
static-analysis	47s
test (2/4)	1m 9s
test (4/4)	50s
build	25s
test (1/4)	41s
test (3/4)	1m 10s
test (one-process pollution detector)	0s
typecheck	3s
prettier	2s
eslint	2s
build-and-test	4s
test (src)	3s
	5m 16s