bee6e468bb
The Windows client relies on scoped guards to restore TAP MTU, interface metric, default-route policy, and the relay host route when the client exits. Those cleanups are still best-effort because they run from Drop, but silently ignoring errors makes the manual MVP test harder to recover from if Windows refuses one of the restore operations. Log cleanup failures with the interface family, index, LUID, or relay route identity involved. Successful cleanup remains quiet, and the guard ownership model is unchanged. Test Plan: - cargo fmt --check - cargo test -p lanparty-client-route - cargo check -p lanparty-client-route --target x86_64-pc-windows-msvc - cargo clippy -p lanparty-client-route --all-targets -- -D warnings - cargo clippy -p lanparty-client-route --target x86_64-pc-windows-msvc \ -- -D warnings - cargo test --workspace - cargo clippy --workspace --all-targets -- -D warnings - git diff --check - git diff --cached --check Refs: MVP Windows cleanup diagnostics