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- Add host-level AAAA DNS sanity test against CoreDNS - Fail hard on SERVFAIL (breaks Node/getaddrinfo with EAI_AGAIN) - Allow empty AAAA responses (IPv4-only setup is valid) - Keep A-record validation unchanged This prevents silent IPv6 resolver regressions that break CSP checks. https://chatgpt.com/share/696abc27-19dc-800f-9ead-6598c2f3c302