The `host` section in `tsunagi status` previously hardcoded
`implementation: userspace WireGuard (boringtun); no kernel module needed`
and omitted information about data plane protocols supported by the build.
Changes:
- Add `protocols` row to `host_section` listing supported protocols
and their wire versions (`wg-quic (wire v4), tcp-tls (wire v1)`) with a note
directing to `tsunagi protocols` for detailed options.
- Update `implementation` row to reflect the multi-protocol userspace
data plane (`userspace overlay (boringtun WireGuard, TCP TLS 1.3); no kernel module needed`).
Validation on Linux:
- `cargo fmt --all -- --check` passed.
- `cargo clippy --locked --workspace --all-targets -- -D warnings` passed.
- `cargo test --locked --workspace --all-targets` passed.