Transmission is intros and "I just linked in."

Drop:

* handle
* city-region (not a street address)
* what deck you actually carry (laptop / phone / frankenbox)
* one thing you want from this node (boards, TRACE, chat, or just a quiet hang)

Guests can read. Handles transmit. If you already ran TRACE on , say what issuer you saw — that counts as a handshake.