remove username sniffer

docs/architecture.md

@@ -65,9 +65,9 @@ share a keystream beyond that first frame.
 ```
 Player            Hub                          Client                 Destination
   │─ Handshake(addr="mc.example.com", Intent=2)─▶ normalize + regex-match
-  │  (+ maybe pipelined Login Start)      │  pause player socket,
+  │                                       │  pause player socket,
   │                                       │  buffer bytes, mint CID
-  │                                       │─ ControlRequest(CID, pattern, ip:port, user) ─▶
+  │                                       │─ ControlRequest(CID, pattern, ip:port) ─▶
   │                                       │                          allocate worker+stream
   │                                       │◀──────── SYN(streamId, CID) ────────────│
   │                                       │  takePending(CID) → bind        dial destination,