Add sev help subcommand aliasing top-level usage - #31
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…usage (per-subcommand usage via `sev <cmd> --help`, e.g. `sev status --help`, now renders that command's args/flags)
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Summary
helpas a real subcommand that resolves to{:help, []}, sosev helpprints the top-level usage block (alias forsev --help)helpnow appears in the generated subcommand list, making it discoverablesev <cmd> --help(e.g.sev status --help) is unchangedTest plan
mix test test/severance/cli_test.exs— addedparse_args(["help"]) == {:help, []}, 64 passedmix quality(full, incl. dialyzer) green via pre-commit hookSeverance.CLI.usage()—helplisted under Sub-commands