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Johnathan Corgan
1bfb58845a
TCP (and future Tor) transports previously established connections synchronously inside send(), blocking the node's RX event loop during TCP handshake. This is particularly problematic for Tor where SOCKS5 circuit establishment can take 30-120 seconds. Add a non-blocking connect path: - ConnectionState enum in transport layer (None/Connecting/Connected/Failed) - connect_async() on TcpTransport spawns background TCP connect task - connection_state_sync() polls task completion, promotes to pool - TransportHandle gains connect() and connection_state() dispatch methods - Node tracks PendingConnect entries for connection-oriented transports - initiate_connection() defers handshake for connection-oriented transports - start_handshake() extracted as separate method for deferred invocation - poll_pending_connects() in tick handler polls and completes handshakes - Failed connects trigger retry via schedule_retry() Connectionless transports (UDP, Ethernet) are unchanged — connect() is a no-op and connection_state() always returns Connected. The existing connect-on-send path in send_async() is preserved as fallback for reconnection after connection drops. 811 tests pass (6 new), clippy clean.