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      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "No source contains this named certificate, permit or signed notice; related topic alone does not satisfy the artifact request."
    },
    {
      "id": "irrigation-absent-de",
      "pair_id": "irrigation-absent",
      "split": "held_out",
      "language": "de",
      "query": "Laborbericht zur Trinkwassereignung des Wassers im Linden-Tank",
      "required_artifact": "specific certificate, permit or signed notice described in the query",
      "query_id": "irrigation-absent-de",
      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "No source contains this named certificate, permit or signed notice; related topic alone does not satisfy the artifact request."
    },
    {
      "id": "ferry-target-en",
      "pair_id": "ferry-target",
      "split": "held_out",
      "language": "en",
      "query": "rota rules for cancelling Saturday ferry trips when a crew member is unavailable",
      "required_artifact": "document with the requested operative rule",
      "query_id": "ferry-target-en",
      "expected_ids": [
        "ferry-a"
      ],
      "classification": "positive",
      "rationale": "Target document explicitly states the requested rule; the paired document concerns a different procedure."
    },
    {
      "id": "ferry-target-de",
      "pair_id": "ferry-target",
      "split": "held_out",
      "language": "de",
      "query": "Dienstplanregeln zur Absage von Samstagsfahrten bei Ausfall eines Fährbesatzungsmitglieds",
      "required_artifact": "document with the requested operative rule",
      "query_id": "ferry-target-de",
      "expected_ids": [
        "ferry-a"
      ],
      "classification": "positive",
      "rationale": "Target document explicitly states the requested rule; the paired document concerns a different procedure."
    },
    {
      "id": "ferry-contrast-en",
      "pair_id": "ferry-contrast",
      "split": "held_out",
      "language": "en",
      "query": "fare sheet listing the cost of taking a bicycle on the ferry",
      "required_artifact": "document containing the requested procedure or tariff",
      "query_id": "ferry-contrast-en",
      "expected_ids": [
        "ferry-b"
      ],
      "classification": "positive",
      "rationale": "Contrasting document explicitly states this requested procedure or tariff."
    },
    {
      "id": "ferry-contrast-de",
      "pair_id": "ferry-contrast",
      "split": "held_out",
      "language": "de",
      "query": "Tarifblatt mit den Kosten für die Fahrradmitnahme auf der Fähre",
      "required_artifact": "document containing the requested procedure or tariff",
      "query_id": "ferry-contrast-de",
      "expected_ids": [
        "ferry-b"
      ],
      "classification": "positive",
      "rationale": "Contrasting document explicitly states this requested procedure or tariff."
    },
    {
      "id": "ferry-absent-en",
      "pair_id": "ferry-absent",
      "split": "held_out",
      "language": "en",
      "query": "signed engineering certificate for replacing the Alder Ferry diesel engine",
      "required_artifact": "specific certificate, permit or signed notice described in the query",
      "query_id": "ferry-absent-en",
      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "No source contains this named certificate, permit or signed notice; related topic alone does not satisfy the artifact request."
    },
    {
      "id": "ferry-absent-de",
      "pair_id": "ferry-absent",
      "split": "held_out",
      "language": "de",
      "query": "unterschriebenes Ingenieurzertifikat zum Austausch des Dieselmotors der Alder-Fähre",
      "required_artifact": "specific certificate, permit or signed notice described in the query",
      "query_id": "ferry-absent-de",
      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "No source contains this named certificate, permit or signed notice; related topic alone does not satisfy the artifact request."
    },
    {
      "id": "pattern-build-en",
      "pair_id": "pattern-build",
      "split": "calibration",
      "language": "en",
      "query": "implementation that builds a packed matcher from several byte patterns",
      "required_artifact": "source implementation of packed matcher construction",
      "query_id": "pattern-build-en",
      "expected_ids": [
        "code-pattern"
      ],
      "classification": "positive",
      "rationale": "Builder::build and Builder::add assemble packed searchers."
    },
    {
      "id": "pattern-build-de",
      "pair_id": "pattern-build",
      "split": "calibration",
      "language": "de",
      "query": "Implementierung zum Aufbau eines gepackten Suchers aus mehreren Byte-Mustern",
      "required_artifact": "source implementation of packed matcher construction",
      "query_id": "pattern-build-de",
      "expected_ids": [
        "code-pattern"
      ],
      "classification": "positive",
      "rationale": "Builder::build and Builder::add assemble packed searchers."
    },
    {
      "id": "pattern-range-en",
      "pair_id": "pattern-range",
      "split": "calibration",
      "language": "en",
      "query": "code that returns the first match among several byte patterns inside a bounded span of a byte string",
      "required_artifact": "source implementation of bounded pattern search",
      "query_id": "pattern-range-en",
      "expected_ids": [
        "code-pattern"
      ],
      "classification": "positive",
      "rationale": "Searcher::find_in implements bounded-span dispatch."
    },
    {
      "id": "pattern-range-de",
      "pair_id": "pattern-range",
      "split": "calibration",
      "language": "de",
      "query": "Code, der den ersten Treffer unter mehreren Byte-Mustern innerhalb eines begrenzten Bytebereichs zurückgibt",
      "required_artifact": "source implementation of bounded pattern search",
      "query_id": "pattern-range-de",
      "expected_ids": [
        "code-pattern"
      ],
      "classification": "positive",
      "rationale": "Searcher::find_in implements bounded-span dispatch."
    },
    {
      "id": "pattern-absent-en",
      "pair_id": "pattern-absent",
      "split": "calibration",
      "language": "en",
      "query": "implementation of TLS certificate hostname verification",
      "required_artifact": "source implementation of TLS hostname verification",
      "query_id": "pattern-absent-en",
      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "Neither code source nor customer document implements certificate verification."
    },
    {
      "id": "pattern-absent-de",
      "pair_id": "pattern-absent",
      "split": "calibration",
      "language": "de",
      "query": "Implementierung der Hostnamenprüfung für TLS-Zertifikate",
      "required_artifact": "source implementation of TLS hostname verification",
      "query_id": "pattern-absent-de",
      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "Neither code source nor customer document implements certificate verification."
    },
    {
      "id": "version-parse-en",
      "pair_id": "version-parse",
      "split": "held_out",
      "language": "en",
      "query": "parser for semantic version numbers with prerelease and build metadata",
      "required_artifact": "source implementation parsing SemVer components",
      "query_id": "version-parse-en",
      "expected_ids": [
        "code-version"
      ],
      "classification": "positive",
      "rationale": "FromStr for Version parses major/minor/patch, prerelease and build."
    },
    {
      "id": "version-parse-de",
      "pair_id": "version-parse",
      "split": "held_out",
      "language": "de",
      "query": "Parser für semantische Versionsnummern mit Vorabversion und Build-Metadaten",
      "required_artifact": "source implementation parsing SemVer components",
      "query_id": "version-parse-de",
      "expected_ids": [
        "code-version"
      ],
      "classification": "positive",
      "rationale": "FromStr for Version parses major/minor/patch, prerelease and build."
    },
    {
      "id": "version-wildcard-en",
      "pair_id": "version-wildcard",
      "split": "held_out",
      "language": "en",
      "query": "implementation rejecting a lone wildcard followed by additional version comparators, for example *, >=1.0.0",
      "required_artifact": "source implementation checking wildcard comparator constraints",
      "query_id": "version-wildcard-en",
      "expected_ids": [
        "code-version"
      ],
      "classification": "positive",
      "rationale": "VersionReq parsing rejects WildcardNotTheOnlyComparator."
    },
    {
      "id": "version-wildcard-de",
      "pair_id": "version-wildcard",
      "split": "held_out",
      "language": "de",
      "query": "Implementierung zum Ablehnen eines alleinstehenden Platzhalters mit weiteren Versionsvergleichern, zum Beispiel *, >=1.0.0",
      "required_artifact": "source implementation checking wildcard comparator constraints",
      "query_id": "version-wildcard-de",
      "expected_ids": [
        "code-version"
      ],
      "classification": "positive",
      "rationale": "VersionReq parsing rejects WildcardNotTheOnlyComparator."
    },
    {
      "id": "version-absent-en",
      "pair_id": "version-absent",
      "split": "held_out",
      "language": "en",
      "query": "implementation that verifies an Ed25519 digital signature",
      "required_artifact": "source implementation of Ed25519 verification",
      "query_id": "version-absent-en",
      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "No source implements digital signature verification."
    },
    {
      "id": "version-absent-de",
      "pair_id": "version-absent",
      "split": "held_out",
      "language": "de",
      "query": "Implementierung zur Prüfung einer digitalen Ed25519-Signatur",
      "required_artifact": "source implementation of Ed25519 verification",
      "query_id": "version-absent-de",
      "expected_ids": [],
      "classification": "absent_artifact",
      "rationale": "No source implements digital signature verification."
    }
  ]
}