Resolves the 'quinn has no proxy support' blocker for QUIC client
connections in alknet-call. Quinn routes every network byte through the
public quinn::AsyncUdpSocket trait, and Endpoint::new_with_abstract_socket
accepts any impl — so a SOCKS5 UDP ASSOCIATE tunnel wrapped as that trait
gives full QUIC-through-proxy support with no fork.
An end-to-end PoC (/workspace/quinn-proxy-poc) confirms a quinn client can
complete a QUIC handshake and exchange stream data through a SOCKS5 proxy
with UDP support (5/5 runs clean, clippy clean). The load-bearing impl is
~250 lines. Integration into alknet-call is ~30 lines in connect() plus one
new module, behind a new optional socks5 feature flag.
Limitations: ECN is lost across the proxy (quinn falls back to non-ECN), and
the proxy must support UDP ASSOCIATE (ssh -D does not). Both are acceptable
for alknet's call-protocol use.
glm-5.2
ed40f95d96