d1dadfb962
Upstream quic-interop-runner split its config into implementations_quic.json + implementations_webtransport.json so QUIC and WebTransport endpoint registrations don't collide. Schema is unchanged; just the filename. Also updated the Makefile comment + plan doc for consistency. https://claude.ai/code/session_01HcvfQq1ttPV9PkRoJb4nyT