Compose Session from SessionSender (writer + outbound AEAD/seq) and
SessionReceiver (reader + inbound AEAD + replay window); split() hands back
the two halves so a VPN data path can run concurrent read/write tasks
(recv_frame is not cancellation-safe, so select! on one &mut Session is unsafe).
send_frame/recv_frame/peer_id/into_inner unchanged; 13 tests still green.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
xah30
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