fix(cli): group-level help — rome <group> / <group> --help - #33
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…known-subcommand errors A bare group or 'rome cookbook --help' printed 'Unknown command' plus the full catalog. Both are now help requests (exit 0) scoped to the group's commands; an unknown subcommand errors with the group's usage instead of the full help.
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rome cookbook --help(androme facts, bare) printedUnknown commandfollowed by the full command catalog — the group-level gap left by #24, which covered per-command--helponly.Now:
rome <group>/rome <group> --help|-h|help→ that group's usage (its commands + summaries), exit 0.rome <group> <unknown-sub>→Unknown commandwith the help scoped to the group's commands instead of the full catalog, exit 1.Test-first: three new behavioral cases in
test/cli.test.ts(group--helpexits 0 without "Unknown command", bare group is a help request, unknown-subcommand error excludes unrelated commands) — 125/125 pass locally, build clean.