Expose NAPI serve() per ADR-016. WraithServer provides close() and
onConnection(callback) for receiving SSH channel streams from
incoming connections. Each connection produces a WraithServerStream
(Duplex-like read/write/close) with ConnectionInfo (remoteAddr,
transportKind). Supports TCP transport with optional authorizedKeys
and certAuthority auth. TLS and iroh transports return helpful errors
indicating future support.
- Add WraithConnectOptions struct with napi fields: server, peer, transport,
identity (string path or Buffer), tlsServerName, insecure, irohRelay, proxy
- Add WraithStream napi class wrapping SSH channel read/write halves via
ChannelStream::into_stream() + tokio::io::split()
- Implement connect() async function: transport creation (tcp, tls), SSH client
connection, authenticate, open direct_tcpip channel, return WraithStream
- Identity field accepts file path (string) or in-memory key data (Buffer)
- All Rust errors marshalled to JavaScript exceptions with descriptive messages
- Add ForwardError enum to wraith-core (required by forward.rs)
- Enable tls, iroh features on wraith-core dependency
- 7 unit tests for key source resolution and address parsing
