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Phase 4.2 (PR #12) and test coverage improvement (PR #13) independently added overlapping test functions. Remove duplicates from PR #13 files: - internal/dns/iterative_test.go: remove TestExtractNSNames, TestExtractNSNamesEmpty, TestIterativeQueryWithExchangeSuccess, TestIterativeQueryWithExchangeNilResponse, TestIterativeQueryWithExchangeTCPFallback (kept in roots_test.go and query_test.go from PR #12) - internal/output/coverage_test.go: remove TestRRDataStringDefault, TestContainsString, TestCollectUniqueServerIPs, TestNewFormatterNilWriter (kept in stats_test.go and formatter_test.go from PR #12) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: multica-agent <github@multica.ai>