udp_runtime: IPv4 libc socket and Node pump#25
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- Add UdpSocket (bind, recv/send) and pumpOnce wiring to handleReceive - Link libc on zig_discv5 for std.c datagram I/O - Tests: localhost WHOAREYOU round-trip and MSG_DONTWAIT idle path Closes #16.
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Implements the UDP/event-loop gap from #16: an IPv4 datagram socket wrapper (
recvfrom/sendto),pumpOncethat forwards one receive intoNode.handleReceiveand sends replies, andMSG_DONTWAITsupport for non-blocking polls.The
zig_discv5module now setslink_libc = truesostd.csocket calls resolve on POSIX.Tests: localhost round-trip (ordinary → WHOAREYOU) plus a non-blocking idle pump.
Closes #16.