Drives the WASM FoctetSession as the handshake
initiator over a real browser WebSocket
against the native websock_message_server responder (tests.md
§3.3). Each binary WebSocket message carries one Foctet frame: the
handshake control messages, then sealed application messages.
Start the native server first (from the repo root):
cargo run -p foctet-transport --example websock_message_server
--features "runtime-tokio transport-websock" -- --role server --addr
127.0.0.1:4460