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feat(subagent): verify requires_tools pre-spawn with fail-closed preflight #2949

Job	Run time
static-analysis	51s
build	8s
test (2/4)	43s
test (4/4)	40s
test (3/4)	1m 33s
test (1/4)	31s
test (one-process pollution detector)	-1s
prettier	3s
typecheck	2s
eslint	3s
test (src)	3s
build-and-test	3s
	4m 39s