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quinn is now treated as a flawless-required interop target alongside aioquic, picoquic, and quic-go. Most Rust-based Nostr/MoQ relays our users run their servers on are built on quinn, so an interop regression there is a user-visible regression. Validated by a 3-round flakiness sweep (1 full matrix + 2 audio-critical subsets) — zero result flakiness across 528 test executions across all four peers, with two environmental docker-compose stall classes documented separately. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>