v0.8.3

What's Changed

• perf(core): don't hand out an allocated empty buffer from FrameExchange::take_buffered by @deepso7 in #363
• QUIC write fairness: per-stream cap, round-robin admission, control reserve by @deepso7 in #358
• Relayed connect: DCUtR holder rounds, bounded upgrade budgets, single terminal, clearer errors by @deepso7 in #365
• Endpoint stream writer, two-id stream ops, error predicates by @deepso7 in #362
• 0.7.5 review follow-ups: Endpoint close report, event conn_ids, NAT/relay/swarm fixes by @deepso7 in #366
• Relay per-IP and /64 admission limits; AutoNAT distinct-server quorum by @deepso7 in #364

Full Changelog: v0.8.2...v0.8.3