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zeekay
50bb61b428
Conn and Stream are now the contract every transport realises, not concrete
TCP/byte-pipe types. The frame-muxing TCP/Unix/TLS realisation becomes
muxConn/muxStream (muxes ZAP frames over one io.ReadWriteCloser). All
constructors (NewConn, NewStreamConn, Dial*, DialTLS*) return the Conn
interface; OpenStream returns the Stream interface; Pool is over Conn;
Server.conns is map[Conn]struct{}; StreamHandler takes Stream.
TLS() moves onto the interface (nil for plaintext loopback). PQ-TLS stays the
production default; plaintext Dial/Listen is the explicit loopback/test path.
No compat shims — forward-only.
Downstream consumers update *transport.Conn -> transport.Conn and
*transport.Stream -> transport.Stream mechanically.