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feat: add DNS query/response layer with miekg/dns #3

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gary merged 2 commits from agent/go-expert-developer/ad0c58a4 into main 2026-06-05 05:37:40 +00:00
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Author SHA1 Message Date
Gary 2338abd14f Merge remote-tracking branch 'origin/main' into agent/go-expert-developer/8e316e05
CI / test (pull_request) Failing after 3h12m56s
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# Conflicts:
#	go.mod
#	go.sum
 2026-06-05 15:34:57 +10:00
Garyandmultica-agent fce7920611 feat: add DNS query/response layer with miekg/dns 
Phase 1.2 implementation:

- internal/dns/types.go: DNS record type constants (A, AAAA, NS, CNAME, SOA,
  MX, TXT, SRV, PTR, ANY) with QNameType helper and EDNS0 defaults
- internal/dns/query.go: Query/QueryWithExchange with UDP, configurable
  EDNS0 buffer size, TCP fallback on truncation, always-TCP mode, configurable
  retries with timeout, context support, and injectable ExchangeFunc for testing
- internal/dns/decode.go: Response classification (answer, referral, NODATA,
  NXDOMAIN, SERVFAIL), CNAME chain extraction with dedup, truncation/RCODE
  detection, and section extraction utilities

32 unit tests covering all acceptance criteria.

Co-authored-by: multica-agent <github@multica.ai>
 2026-06-05 15:14:56 +10:00