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refactor!: remove sandbox and support engines; simplify the CLI #1396

Job	Run time
markdown	10s
deadcode	58s
public module graph	3m 14s
duplication	14s
workspace and module parity	17s
secrets	12s
format	29s
vet	1m 19s
module hygiene	3m 50s
test (race + coverage)	0s
fuzz (60s)	-1s
api reference	16s
smoke	0s
lint	0s
security	0s
build (${{ matrix.goos }}/${{ matrix.goarch }})	0s
	10m 58s