0fb4689cb2
The manual lifecycle check depends on the Windows client diagnostics moving from connected, to disconnected, and back to connected when the LAN gateway is restarted. Existing formatter tests covered a gateway leave, but not the replacement join updating the tracked gateway peer id afterward. Add a client lifecycle unit test that formats the first gateway join, its leave, and a replacement gateway join. The assertions prove the client-side relay status clears the old peer id and then reports the new gateway as connected. Test Plan: - cargo fmt --check - cargo test -p lanparty-client-win \ tracks_gateway_replacement_after_disconnect -- --nocapture - cargo test -p lanparty-client-win - cargo test --workspace - cargo clippy --workspace --all-targets -- -D warnings - git diff --check Refs: MVP lifecycle sanity check