Iroh noq hard-forks Quinn for QUIC

This is an infrastructure story disguised as a library announcement: n0 is no longer just patching Quinn, it now owns the transport semantics it needs for peer-to-peer networking.

• –Multipath moves relay, IPv4, and IPv6 paths into QUIC itself, which should make path switching and congestion control much cleaner than the old “hide it below the stack” approach.
• –Bringing NAT traversal into QUIC is the bigger bet; it gives hole-punching visibility to encryption, loss recovery, and congestion control instead of treating it as side-channel plumbing.
• –The hard fork suggests Quinn’s upstream pace and n0’s transport ambitions diverged enough that staying close would have slowed both sides down.
• –For developers building sync, messaging, or mobile P2P apps, noq is interesting because it aims to make flaky real-world networks a first-class case, not an edge case.
• –Interoperability testing against picoquic is a good sign that this is meant to be a real implementation, not just an experimental fork.