{
  "protocol": {
    "name": "CVP",
    "version": "1.0.0-proposed",
    "revision": "2026-09-13",
    "spec_sha256": "f62725968356c92930531cd6085db76e216da06e95be53d636b0d2cf3218b148",
    "spec": "https://www.calculatorx.com/developers/cvp/spec/1.0"
  },
  "document_status": "proposed",
  "calculator": {
    "id": "swg-to-mm",
    "version": "1.3.1",
    "title": "SWG to mm / mm² Calculator",
    "formula_family": "swg-geometry",
    "capability_id": "electrical.swg_to_mm",
    "verification_revision": "2026-09-10.authoritative-provenance"
  },
  "profile": "engineering",
  "status": "VERIFIED",
  "verification_status": "VERIFIED",
  "production_freshness": "CURRENT",
  "overall_trust": "VERIFIED",
  "runner": {
    "name": "cvp-runner",
    "version": "1.0.0"
  },
  "environment": {
    "runtime": "node",
    "runtime_version": "20.19.2",
    "numeric_model": "IEEE-754 binary64",
    "os": "darwin"
  },
  "suite": {
    "id": "swg-to-mm",
    "version": "1.3.1",
    "uri": "https://www.calculatorx.com/evidence/electrical.swg_to_mm/1.3.1.json",
    "verification_revision": "2026-09-10.authoritative-provenance"
  },
  "obligation_set": [
    "CVP-PROV-01",
    "CVP-MODEL-01",
    "CVP-SCOPE-01",
    "CVP-UNIT-01",
    "CVP-REF-01",
    "CVP-GOLD-01",
    "CVP-BND-01",
    "CVP-INV-01",
    "CVP-NUM-01",
    "CVP-COV-01",
    "CVP-CONTRACT-01",
    "CVP-DEP-01",
    "CVP-ART-01",
    "CVP-PROD-01",
    "CVP-DIM-01",
    "CVP-PROP-01",
    "CVP-IFACE-01"
  ],
  "provenance": {
    "mode": "direct",
    "sources": [
      {
        "label": "British Standards Institution — BS 3737:1964",
        "kind": "standard",
        "reference": "Guide to series of basic sizes for metal sheet, strip and wire — Status: Withdrawn. Public catalogue confirms identity/status. Exact PDF table/clause/page is not asserted. The 57-row inch dataset was independently checked 2026-09-10 against Wikipedia, Engineering Toolbox, and Trojan SF (57/57 inch identity); 0.324 in is canonical SWG 0, with 1/0 as alias.",
        "url": "https://knowledge.bsigroup.com/products/guide-to-series-of-basic-sizes-for-metal-sheet-strip-and-wire"
      },
      {
        "label": "NIST Guide to the SI (SP 811)",
        "kind": "other",
        "reference": "Millimetre as the SI unit for length; 1 in = 25.4 mm exactly",
        "url": "https://www.nist.gov/pml/special-publication-811"
      }
    ]
  },
  "reference": {
    "items": [
      {
        "class": "O1",
        "reference_scope": "model",
        "scope": "model",
        "label": "BS 3737:1964 (Withdrawn) identity + independently checked 57-row inch dataset (PDF table/clause not asserted)"
      },
      {
        "class": "O2",
        "reference_scope": "expected_values",
        "scope": "expected_values",
        "label": "Dataset-backed SWG geometry oracle — 57 gauges from swg-reference-inch.json (not IUT)",
        "engine": {
          "name": "swg-to-mm-reference",
          "precision_bits": 53,
          "independent_of_iut": true,
          "table_sha256": "2eeebd6d80aacde5920c57fde7b8179bfc5b1e513fb6f5a104d3d271e03d4a10",
          "source": "scripts/data/swg-reference-inch.json",
          "public_table": "/developers/cvp/reproduce/swg-reference-inch.json",
          "public_checker": "/developers/cvp/reproduce/check-swg-reference-inch.mjs"
        }
      },
      {
        "class": "O2",
        "reference_scope": "numerical_behavior",
        "scope": "numerical_behavior",
        "label": "Same dataset-backed O2 backs ≤2 ULP diameter/area comparison vs IUT",
        "engine": {
          "name": "swg-to-mm-reference",
          "precision_bits": 53,
          "independent_of_iut": true,
          "table_sha256": "2eeebd6d80aacde5920c57fde7b8179bfc5b1e513fb6f5a104d3d271e03d4a10",
          "source": "scripts/data/swg-reference-inch.json",
          "public_table": "/developers/cvp/reproduce/swg-reference-inch.json",
          "public_checker": "/developers/cvp/reproduce/check-swg-reference-inch.mjs",
          "extra_table_sha256": "6e58c1cd492dc1b8f2061ab65e8246d55858f778c82ad9890221fcf858b59fbd"
        }
      }
    ],
    "notes": "O2 loads scripts/data/swg-reference-inch.json (sha256=2eeebd6d80aa…). Canonical n:inch digest dataset=6e58c1cd492d… engine=6e58c1cd492d… row compare 57/57. Public copy: /developers/cvp/reproduce/swg-reference-inch.json. Checker: /developers/cvp/reproduce/check-swg-reference-inch.mjs. Provenance: BS 3737:1964 not_verified_from_open_preview; independent catalogue identity 3 sources."
  },
  "controls": {
    "CVP-PROV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Sources present on evidence"
    },
    "CVP-MODEL-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "BS 3737:1964 (Withdrawn) identity confirmed; 57-row inch table independently checked against public catalogues; exact PDF table/clause not asserted"
    },
    "CVP-SCOPE-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Discrete gauges 7/0 (−6)…50 only"
    },
    "CVP-UNIT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "SWG → mm / mm²"
    },
    "CVP-REF-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "O1 model + O2 dataset-backed expected_values/numerical_behavior; 57/57 inch-row identity vs IUT; independently checked public-catalogue provenance (BS 3737 PDF table not asserted)"
    },
    "CVP-GOLD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "63/63 legacy golden; 62/62 oracle-backed numeric"
    },
    "CVP-BND-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "7/7 CVP boundary · 8/8 legacy Evidence boundary"
    },
    "CVP-INV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "8 Evidence illegal-input + 5/5 oracle-backed error-code (exact_error_match, not ULP)"
    },
    "CVP-NUM-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "max_error_observed_ulp=0; policy declared a priori"
    },
    "CVP-COV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "8/8 declared partitions (heavy-gauge, zero-alias, ordinary-gauge, endpoints, field-mm, field-mm2, invalid-type, invalid-range) · 63 legacy golden / 7 CVP boundary unique cases · 8 Evidence invalid-input (may overlap boundary)"
    },
    "CVP-CONTRACT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "4/4 CVP contract"
    },
    "CVP-DEP-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "engine swg; Node binary64"
    },
    "CVP-ART-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "release_integrity.status=verified · digests: artifact_evidence_sha256=Evidence core (Trust freshness) · cvp_evidence_digest=artifacts.evidence_digest (fingerprint v2) · evidence_bundle_sha256=legacy Evidence JSON bytes · evidence_catalog_digest=attested_catalog_sha256 · production_sha256=bound production report · see artifacts.digest_registry"
    },
    "CVP-PROD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "this calculator CURRENT · bound snapshot pass @ 2026-09-16T23:18:54.751Z · live site-wide report stale @ 2026-09-16T23:19:00.989Z (9 other capabilities) · local checks pass · attestation_id=bf3fe5ab59e4bbc9e50f340c6c537d3cf046a9b32473980b03131666eea4e751 · This calculator CURRENT · This calculator is not affected · Bound attestation PASS @ 2026-09-16T23:18:54.751Z · Live production status STALE (9 capabilities; 155 remain CURRENT) @ 2026-09-16T23:19:00.989Z · Public schema 1.3.1 matches · Semantic contract ✓ · Production attested · Public/cache ✓ · Origin ✓ · schema_const=1.3.1 · report output-const=pass · evidence-sha256=pass · semantic-contract=pass · capability-html-public-origin-agree=pass · cvp-manifest-public-origin-agree=pass · cvp-latest-alias-agrees=pass · cvp-immutable-manifest-fetch=pass · cvp-immutable-manifest-sha256=pass · cvp-latest-alias-matches-immutable=pass · calculator-html-cvp-projection=pass · evidence-html-cvp-projection=pass · attested_evidence_sha256=58fe84b53a8948a8ed33bf1d0f10c2dc305d423b0415cb204b41bee40e09d0f5 · verified_at=2026-09-10T13:18:53.035Z · evidence_attested_at=2026-09-10T13:18:53.035Z · last_confirmed_current_at=2026-09-16T23:18:54.751Z · rendered_at=2026-09-16T23:19:01.025Z · binds=cvp_core_sha256",
      "check_result": "PASS",
      "production_state": "CURRENT",
      "binding_current": true
    },
    "CVP-DIM-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "Wire diameter and cross-section"
    },
    "CVP-PROP-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "3/3 property"
    },
    "CVP-META-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No input→output transformation vectors in pack — control not in obligation set"
    },
    "CVP-ROUND-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No inverse / round-trip vectors in pack — control not in obligation set"
    },
    "CVP-XCAL-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No related calculator in the same formula family / no related-identity peers declared — control not in obligation set"
    },
    "CVP-IFACE-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only."
    },
    "CVP-ORACLE-01": {
      "result": "SKIP",
      "applicability": "higher_assurance",
      "notes": "O2 present; O3 not required this wave"
    },
    "CVP-EXP-01": {
      "result": "SKIP",
      "applicability": "optional",
      "notes": "named expert review not performed"
    }
  },
  "tests": {
    "golden": {
      "passed": 62,
      "total": 62,
      "failed": 0,
      "case_ids": [
        "g-swg-7o0-mm",
        "g-swg-7o0-mm2",
        "g-swg-6o0-mm",
        "g-swg-5o0-mm",
        "g-swg-4o0-mm",
        "g-swg-3o0-mm",
        "g-swg-2o0-mm",
        "g-swg-0-mm",
        "g-swg-1-mm",
        "g-swg-2-mm",
        "g-swg-3-mm",
        "g-swg-4-mm",
        "g-swg-5-mm",
        "g-swg-6-mm",
        "g-swg-7-mm",
        "g-swg-8-mm",
        "g-swg-9-mm",
        "g-swg-10-mm",
        "g-swg-11-mm",
        "g-swg-12-mm",
        "g-swg-13-mm",
        "g-swg-14-mm",
        "g-swg-14-mm2",
        "g-swg-15-mm",
        "g-swg-16-mm",
        "g-swg-17-mm",
        "g-swg-18-mm",
        "g-swg-19-mm",
        "g-swg-20-mm",
        "g-swg-21-mm",
        "g-swg-22-mm",
        "g-swg-22-mm2",
        "g-swg-23-mm",
        "g-swg-24-mm",
        "g-swg-25-mm",
        "g-swg-26-mm",
        "g-swg-27-mm",
        "g-swg-28-mm",
        "g-swg-29-mm",
        "g-swg-30-mm",
        "g-swg-31-mm",
        "g-swg-32-mm",
        "g-swg-33-mm",
        "g-swg-34-mm",
        "g-swg-35-mm",
        "g-swg-36-mm",
        "g-swg-37-mm",
        "g-swg-38-mm",
        "g-swg-39-mm",
        "g-swg-40-mm",
        "g-swg-41-mm",
        "g-swg-42-mm",
        "g-swg-43-mm",
        "g-swg-44-mm",
        "g-swg-45-mm",
        "g-swg-46-mm",
        "g-swg-47-mm",
        "g-swg-48-mm",
        "g-swg-49-mm",
        "g-swg-50-mm",
        "g-7-0-token",
        "g-1-0-token"
      ]
    },
    "boundary": {
      "passed": 7,
      "total": 7,
      "failed": 0,
      "case_ids": [
        "boundary-swg-out-of-table",
        "boundary-swg-below",
        "boundary-swg-not-integer",
        "boundary-swg-half",
        "boundary-swg-unparseable",
        "boundary-swg-empty",
        "boundary-swg-missing"
      ]
    },
    "invalid": {
      "passed": 13,
      "total": 13,
      "failed": 0,
      "case_ids": [
        "boundary-swg-out-of-table",
        "boundary-swg-below",
        "boundary-swg-not-integer",
        "boundary-swg-half",
        "boundary-swg-unparseable",
        "boundary-swg-empty",
        "boundary-swg-missing",
        "boundary-swg-invalid-field",
        "inv-swg-oor-high",
        "inv-swg-oor-low",
        "inv-swg-not-int",
        "inv-swg-empty",
        "inv-swg-field"
      ],
      "comparison": "exact_error_match",
      "records": [
        {
          "id": "inv-swg-oor-high",
          "comparison": "exact_error_match",
          "expected": {
            "code": "SWG_OUT_OF_RANGE"
          },
          "actual": {
            "code": "SWG_OUT_OF_RANGE"
          },
          "match": true
        },
        {
          "id": "inv-swg-oor-low",
          "comparison": "exact_error_match",
          "expected": {
            "code": "SWG_OUT_OF_RANGE"
          },
          "actual": {
            "code": "SWG_OUT_OF_RANGE"
          },
          "match": true
        },
        {
          "id": "inv-swg-not-int",
          "comparison": "exact_error_match",
          "expected": {
            "code": "SWG_NOT_INTEGER"
          },
          "actual": {
            "code": "SWG_NOT_INTEGER"
          },
          "match": true
        },
        {
          "id": "inv-swg-empty",
          "comparison": "exact_error_match",
          "expected": {
            "code": "MISSING_REQUIRED_INPUT"
          },
          "actual": {
            "code": "MISSING_REQUIRED_INPUT"
          },
          "match": true
        },
        {
          "id": "inv-swg-field",
          "comparison": "exact_error_match",
          "expected": {
            "code": "INVALID_MODE"
          },
          "actual": {
            "code": "INVALID_MODE"
          },
          "match": true
        }
      ]
    },
    "property": {
      "passed": 3,
      "total": 3,
      "failed": 0,
      "case_ids": [
        "prop-dataset-engine-57",
        "prop-dataset-provenance",
        "prop-alias-1-0"
      ],
      "definition_ids": [
        "swg-inch-table-identity",
        "swg-dataset-provenance",
        "swg-1-0-normalization"
      ]
    },
    "round_trip": {
      "passed": 0,
      "total": 0,
      "failed": 0,
      "case_ids": []
    },
    "metamorphic": {
      "passed": 0,
      "total": 0,
      "failed": 0,
      "case_ids": []
    },
    "contract": {
      "passed": 4,
      "total": 4,
      "failed": 0
    },
    "cross_interface": {
      "passed": 4,
      "total": 4,
      "failed": 0,
      "case_ids": [
        "iface-14",
        "iface-7-0",
        "iface-14-mm2",
        "iface-60-oor"
      ]
    }
  },
  "coverage": {
    "partitions": [
      {
        "id": "heavy-gauge",
        "description": "Heavy gauges 7/0…2/0 (−6…−1)",
        "exercised": true,
        "case_count": 15
      },
      {
        "id": "zero-alias",
        "description": "SWG 0 and 1/0 alias (0.324 in)",
        "exercised": true,
        "case_count": 5
      },
      {
        "id": "ordinary-gauge",
        "description": "Ordinary gauges 1…50",
        "exercised": true,
        "case_count": 106
      },
      {
        "id": "endpoints",
        "description": "Lower/upper endpoints 7/0 and 50",
        "exercised": true,
        "case_count": 8
      },
      {
        "id": "field-mm",
        "description": "Diameter (mm)",
        "exercised": true,
        "case_count": 119
      },
      {
        "id": "field-mm2",
        "description": "Area (mm²)",
        "exercised": true,
        "case_count": 6
      },
      {
        "id": "invalid-type",
        "description": "Invalid type / missing / mode",
        "exercised": true,
        "case_count": 9
      },
      {
        "id": "invalid-range",
        "description": "Out-of-table range",
        "exercised": true,
        "case_count": 4
      }
    ]
  },
  "numerical": {
    "representation": "IEEE-754 binary64",
    "tolerance": {
      "type": "ulp",
      "value": 2,
      "rationale": "SWG inch dataset ×25.4; ≤2 ULP vs O2 that only reads scripts/data/swg-reference-inch.json (same V8). Declared a priori.",
      "declared_before_evaluation": true
    },
    "max_error_observed": 0,
    "records": [
      {
        "id": "g-swg-7o0-mm",
        "reference": 12.7,
        "actual": 12.7,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-7o0-mm2",
        "reference": 126.67686977437442,
        "actual": 126.67686977437442,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-6o0-mm",
        "reference": 11.7856,
        "actual": 11.7856,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-5o0-mm",
        "reference": 10.9728,
        "actual": 10.9728,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-4o0-mm",
        "reference": 10.16,
        "actual": 10.16,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-3o0-mm",
        "reference": 9.448799999999999,
        "actual": 9.448799999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-2o0-mm",
        "reference": 8.839199999999998,
        "actual": 8.839199999999998,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-0-mm",
        "reference": 8.2296,
        "actual": 8.2296,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-1-mm",
        "reference": 7.619999999999999,
        "actual": 7.619999999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-2-mm",
        "reference": 7.010400000000001,
        "actual": 7.010400000000001,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-3-mm",
        "reference": 6.400799999999999,
        "actual": 6.400799999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-4-mm",
        "reference": 5.8928,
        "actual": 5.8928,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-5-mm",
        "reference": 5.384799999999999,
        "actual": 5.384799999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-6-mm",
        "reference": 4.8768,
        "actual": 4.8768,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-7-mm",
        "reference": 4.4704,
        "actual": 4.4704,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-8-mm",
        "reference": 4.064,
        "actual": 4.064,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-9-mm",
        "reference": 3.6575999999999995,
        "actual": 3.6575999999999995,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-10-mm",
        "reference": 3.2512,
        "actual": 3.2512,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-11-mm",
        "reference": 2.9464,
        "actual": 2.9464,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-12-mm",
        "reference": 2.6416,
        "actual": 2.6416,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-13-mm",
        "reference": 2.3367999999999998,
        "actual": 2.3367999999999998,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-14-mm",
        "reference": 2.032,
        "actual": 2.032,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-14-mm2",
        "reference": 3.2429278662239853,
        "actual": 3.2429278662239853,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-15-mm",
        "reference": 1.8287999999999998,
        "actual": 1.8287999999999998,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-16-mm",
        "reference": 1.6256,
        "actual": 1.6256,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-17-mm",
        "reference": 1.4223999999999999,
        "actual": 1.4223999999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-18-mm",
        "reference": 1.2192,
        "actual": 1.2192,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-19-mm",
        "reference": 1.016,
        "actual": 1.016,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-20-mm",
        "reference": 0.9143999999999999,
        "actual": 0.9143999999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-21-mm",
        "reference": 0.8128,
        "actual": 0.8128,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-22-mm",
        "reference": 0.7111999999999999,
        "actual": 0.7111999999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-22-mm2",
        "reference": 0.39725866361243817,
        "actual": 0.39725866361243817,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-23-mm",
        "reference": 0.6096,
        "actual": 0.6096,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-24-mm",
        "reference": 0.5588,
        "actual": 0.5588,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-25-mm",
        "reference": 0.508,
        "actual": 0.508,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-26-mm",
        "reference": 0.45719999999999994,
        "actual": 0.45719999999999994,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-27-mm",
        "reference": 0.41656,
        "actual": 0.41656,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-28-mm",
        "reference": 0.37592,
        "actual": 0.37592,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-29-mm",
        "reference": 0.34543999999999997,
        "actual": 0.34543999999999997,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-30-mm",
        "reference": 0.31495999999999996,
        "actual": 0.31495999999999996,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-31-mm",
        "reference": 0.29463999999999996,
        "actual": 0.29463999999999996,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-32-mm",
        "reference": 0.27432,
        "actual": 0.27432,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-33-mm",
        "reference": 0.254,
        "actual": 0.254,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-34-mm",
        "reference": 0.23367999999999997,
        "actual": 0.23367999999999997,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-35-mm",
        "reference": 0.21335999999999997,
        "actual": 0.21335999999999997,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-36-mm",
        "reference": 0.19304,
        "actual": 0.19304,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-37-mm",
        "reference": 0.17271999999999998,
        "actual": 0.17271999999999998,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-38-mm",
        "reference": 0.1524,
        "actual": 0.1524,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-39-mm",
        "reference": 0.13207999999999998,
        "actual": 0.13207999999999998,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-40-mm",
        "reference": 0.12191999999999999,
        "actual": 0.12191999999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-41-mm",
        "reference": 0.11176,
        "actual": 0.11176,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-42-mm",
        "reference": 0.1016,
        "actual": 0.1016,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-43-mm",
        "reference": 0.09144,
        "actual": 0.09144,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-44-mm",
        "reference": 0.08128,
        "actual": 0.08128,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-45-mm",
        "reference": 0.07111999999999999,
        "actual": 0.07111999999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-46-mm",
        "reference": 0.06095999999999999,
        "actual": 0.06095999999999999,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-47-mm",
        "reference": 0.0508,
        "actual": 0.0508,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-48-mm",
        "reference": 0.04064,
        "actual": 0.04064,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-49-mm",
        "reference": 0.030479999999999997,
        "actual": 0.030479999999999997,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-swg-50-mm",
        "reference": 0.0254,
        "actual": 0.0254,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-7-0-token",
        "reference": 12.7,
        "actual": 12.7,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      },
      {
        "id": "g-1-0-token",
        "reference": 8.2296,
        "actual": 8.2296,
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      }
    ]
  },
  "interfaces": {
    "compared": [
      "ui-ssr",
      "rest",
      "mcp"
    ],
    "result": "PASS",
    "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session. Error-path engine·REST·MCP 1/1 (status, code, calculation_version). SSR compared on URL-canonical requested calculations; empty query is idle (not an error) and JSON-typed object/array inputs are REST/MCP-only."
  },
  "artifacts": {
    "evidence_bundle_sha256": "855fb39b4c48b35dbd22002b5fd75fb5a086da8b3fd9c52fc528750363ed1dcf",
    "evidence_digest": "c2cc961fa9491522a0a63fb1be20bdafc28b6a4930580c29a6e29deb0088d9aa",
    "production_sha256": "58fe84b53a8948a8ed33bf1d0f10c2dc305d423b0415cb204b41bee40e09d0f5",
    "attested_catalog_sha256": "006a786d7fd29244ed7da1c582af2a6072358ff25a2e07cbc8909b3ae65fb0af",
    "production_checks": [
      {
        "id": "electrical.swg_to_mm:output-const",
        "status": "pass",
        "detail": "output const 1.3.1 vs capability 1.3.1",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      },
      {
        "id": "electrical.swg_to_mm:evidence-sha256",
        "status": "pass",
        "detail": "afc2eb51b035",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      },
      {
        "id": "electrical.swg_to_mm:semantic-contract",
        "status": "pass",
        "detail": "76/76",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      },
      {
        "id": "electrical.swg_to_mm:capability-html-public-origin-agree",
        "status": "pass",
        "detail": "public 1.3.1 vs origin 1.3.1",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      },
      {
        "id": "electrical.swg_to_mm:cvp-manifest-public-origin-agree",
        "status": "pass",
        "detail": "electrical.swg_to_mm/1.3.1/2026-09-10.authoritative-provenance/engineering/c2cc961fa949",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z",
        "projection_compared": false
      },
      {
        "id": "electrical.swg_to_mm:cvp-latest-alias-agrees",
        "status": "pass",
        "detail": "electrical.swg_to_mm/1.3.1/2026-09-10.authoritative-provenance/engineering/c2cc961fa949",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z",
        "projection_compared": false
      },
      {
        "id": "electrical.swg_to_mm:cvp-immutable-manifest-fetch",
        "status": "pass",
        "detail": "public=200 origin=200",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      },
      {
        "id": "electrical.swg_to_mm:cvp-immutable-manifest-sha256",
        "status": "pass",
        "detail": "c2cc961fa949",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      },
      {
        "id": "electrical.swg_to_mm:cvp-latest-alias-matches-immutable",
        "status": "pass",
        "detail": "electrical.swg_to_mm/1.3.1/2026-09-10.authoritative-provenance/engineering/c2cc961fa949",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z",
        "projection_compared": false
      },
      {
        "id": "electrical.swg_to_mm:calculator-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      },
      {
        "id": "electrical.swg_to_mm:evidence-html-cvp-projection",
        "status": "pass",
        "detail": "matches Trust display",
        "scope": "last_attestation_snapshot",
        "current": true,
        "attestation_binding_current": true,
        "attested_at": "2026-09-10T13:18:53.035Z"
      }
    ],
    "digest_registry": {
      "digest_algorithm": "sha256",
      "canonicalization": "json-sorted-keys-utf8",
      "entries": [
        {
          "name": "cvp_core_sha256",
          "field": "artifacts.cvp_core_sha256",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "c2cc961fa9491522a0a63fb1be20bdafc28b6a4930580c29a6e29deb0088d9aa",
          "note": "Immutable verification core; excludes attestation/live-status and Evidence contract counts"
        },
        {
          "name": "cvp_evidence_digest",
          "field": "artifacts.evidence_digest",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "c2cc961fa9491522a0a63fb1be20bdafc28b6a4930580c29a6e29deb0088d9aa",
          "note": "Alias of cvp_core_sha256 (historical field name)"
        },
        {
          "name": "artifact_evidence_sha256",
          "field": "release_integrity.digests.evidence_core_sha256",
          "digest_scope": "evidence_artifact_core",
          "value": "afc2eb51b0355be968f18b1d3eda1adce65aa0684d6ee36771960dd60f38e87b",
          "note": "Published Evidence JSON core — Trust freshness / production bind subject"
        },
        {
          "name": "evidence_catalog_digest",
          "field": "artifacts.attested_catalog_sha256",
          "digest_scope": "capability_catalog",
          "value": "006a786d7fd29244ed7da1c582af2a6072358ff25a2e07cbc8909b3ae65fb0af",
          "note": "Capability catalog integrity; site-wide, not per-suite fingerprint"
        }
      ]
    },
    "cvp_core_sha256": "c2cc961fa9491522a0a63fb1be20bdafc28b6a4930580c29a6e29deb0088d9aa"
  },
  "dependencies": [
    {
      "name": "swg-engine",
      "version": "1.3.1"
    },
    {
      "name": "swg-reference-oracle",
      "version": "1.0.0"
    },
    {
      "name": "node",
      "version": "20.19.2"
    }
  ],
  "attestation": {
    "status": "CURRENT",
    "href": "/.well-known/calculatorx-production-attestation.json",
    "id": "bf3fe5ab59e4bbc9e50f340c6c537d3cf046a9b32473980b03131666eea4e751",
    "attested_at": "2026-09-10T13:18:53.035Z",
    "last_confirmed_current_at": "2026-09-16T23:18:54.751Z",
    "site_attestation_current": false,
    "capability_attestation_current": true,
    "bound_snapshot_status": "pass",
    "live_report_status": "stale",
    "bound_attested_at": "2026-09-16T23:18:54.751Z",
    "live_updated_at": "2026-09-16T23:19:00.989Z",
    "bound_snapshot": {
      "status": "pass",
      "attested_at": "2026-09-16T23:18:54.751Z",
      "site_stale_count": 9
    },
    "live_site_status": {
      "href": "/.well-known/calculatorx-production-attestation.json"
    },
    "bound_snapshot_site_stale_count": 9,
    "site_stale_capability_count": 9,
    "evidence_attested_at": "2026-09-10T13:18:53.035Z"
  },
  "domain_review": {
    "status": "ABSENT",
    "spec_version": "1.3.1",
    "external_third_party": false,
    "note": "Named expert review not performed"
  },
  "timestamps": {
    "verified_at": "2026-09-10T13:18:53.035Z",
    "generated_at": "2026-09-10T13:18:53.035Z",
    "rendered_at": "2026-09-16T23:19:01.025Z",
    "notes": "verified_at/generated_at mark the first publication of this cvp_core_sha256 (artifacts.evidence_digest alias) for suite verification. evidence_attested_at/attested_at is the first production bind of that core digest. last_confirmed_current_at is the latest site-wide report that still confirms CURRENT. rendered_at is this JSON serialization and is not part of cvp_core_sha256 / evidence_digest. Production attestation binds cvp_core_sha256 (binds evidence_digest). Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at. attestation.bound_snapshot.site_stale_count is the site-wide stale capability count at Manifest bind time — not a live value. Fetch attestation.live_site_status.href for the current site report."
  },
  "links": {
    "legacy_evidence": "https://www.calculatorx.com/evidence/electrical.swg_to_mm/1.3.1.json",
    "evidence_page": "https://www.calculatorx.com/evidence/electrical.swg_to_mm/1.3.1",
    "calculator": "https://www.calculatorx.com/calc/wire/swg-to-mm",
    "schema": "https://www.calculatorx.com/developers/cvp/schema/cvp-evidence-1.0.json",
    "protocol": "https://www.calculatorx.com/developers/cvp/spec/1.0",
    "manifest": "https://www.calculatorx.com/evidence/electrical.swg_to_mm/1.3.1.cvp.json",
    "manifest_immutable": "https://www.calculatorx.com/evidence/electrical.swg_to_mm/1.3.1/2026-09-10.authoritative-provenance.cvp.json",
    "manifest_core": "https://www.calculatorx.com/evidence/electrical.swg_to_mm/1.3.1/2026-09-10.authoritative-provenance.c2cc961fa949.cvp.json"
  }
}