v0.0.23 Introduce network/packetrelay

[fortuna]

✨ New Features

network/packetrelay — New flow-based PacketRelay API (#618)

Replaces the callback-based PacketProxy with a push-pull design: ReceivePackets blocks in the
caller's goroutine, eliminating boilerplate background goroutines. Includes PacketListenerRelay
(adapts any transport.PacketListener) and TimeoutPacketRelay (RFC 4787 §4.3 compliant idle-timeout
decorator).

network/dnsintercept — New InterceptDNSPacketRelay (#618)

Routes UDP DNS to a dedicated resolver via short-lived per-query associations; passes other traffic
to a default relay.

network/lwip2transport — ConfigureDeviceWithRelay (#618)

Wires the lwIP stack directly to any PacketRelay.

🔄 Deprecations

• network.PacketProxy / PacketProxyHandler — use network/packetrelay. Bridge adapter:
  NewPacketProxyFromPacketRelay.
• lwip2transport.ConfigureDevice — use ConfigureDeviceWithRelay.

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This discussion was created from the release v0.0.23 Introduce network/packetrelay.