7e387ac05faccbe412959903c2567ac8cf7eab9b
Documents the previously-undocumented UDP gateway prior art discussed with the alknet-channels POC agent (/workspace/tun2proxy/src/udpgw.rs): per-datagram length framing over a stream (LEN|FLAGS|CONN_ID|[SOCKS5 addr]|DATA), SOCKS5 ATYP addressing in-band, CONN_ID flow multiplexing, keepalive/ERR flag packets, MTU cap, idle expiry. Folds implications into OQ-TN-01 (addressing fork: per-channel vs per-datagram), OQ-TN-02 (framing mechanics production-proven; remaining fork documented), OQ-TN-07 (single-ALPN option strengthened), OQ-TN-09 (flag-packet vocabulary maps to establishment/error frame question), OQ-TN-10 (UDP POC scope narrowed to channels-layer fit), and the survey checklist. Also records the transport story: TCP vs QUIC is the alkcall layer's concern; the tunnel crate is transport-agnostic.
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