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refactor(cmd): extract contextual-help catalog; fix misleading benchmark #1420

Job	Run time
secrets	11s
duplication	17s
vet	1m 52s
public module graph	3m 6s
module hygiene	3m 33s
workspace and module parity	19s
format	43s
deadcode	55s
markdown	11s
test (race + coverage)	4m 30s
security	3m 36s
lint	3m 5s
api reference	13s
smoke	1m 41s
fuzz (60s)	0s
build (${{ matrix.goos }}/${{ matrix.goarch }})	-1s
	24m 11s