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feat(explorer): ship explorer as a workspace agent package #3679

Job	Run time
static-analysis	49s
test (1/4)	34s
build	15s
test (3/4)	51s
test (2/4)	31s
test (4/4)	38s
test (one-process pollution detector)	0s
prettier	4s
eslint	3s
typecheck	3s
test (src)	2s
build-and-test	3s
	3m 53s