The MVP test guide relies on --iface being both accepted and discoverable from
lanparty-gateway --help. The parser test already covered acceptance, but it did
not protect the rendered help text.
Render the Clap long help in a unit test and assert that the visible alias is
advertised. This keeps the handoff guide and binary self-documentation aligned.
Test Plan:
- cargo fmt --check
- cargo test -p lanparty-gateway iface_alias
- cargo run -p lanparty-gateway -- --help
- cargo test --workspace
- cargo clippy --workspace --all-targets -- -D warnings
- git diff --check
- git diff --cached --check
Refs: MVP gateway test handoff
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