{
  "testedAt": "2026-09-24T15:57:00.187Z",
  "method": "Local reproducible fixture comparison of boundary classification thresholds",
  "disclaimer": "Synthetic examples for boundary conflict analysis; not human measurements and not remote detector output",
  "fixtures": [
    {
      "id": "CASE-OVAL-DIAMOND",
      "description": "High cheekbones with borderline forehead width",
      "faceLengthMm": 190,
      "foreheadWidthMm": 126,
      "cheekboneWidthMm": 138,
      "jawWidthMm": 108,
      "jawAngleDeg": 122,
      "ratioLengthToWidth": 1.377,
      "ratioCheekToForehead": 1.095,
      "ratioCheekToJaw": 1.278,
      "boundaryResult": {
        "strictDiamondRule": "Diamond (cheekbones widest by >8%)",
        "softOvalRule": "Oval (forehead within 10% of cheekbone width)",
        "conflictCause": "A 2mm shift in forehead measurement changes ratio by 1.6%, flipping classification"
      }
    },
    {
      "id": "CASE-SQUARE-ROUND",
      "description": "Equal width and length with intermediate jaw curvature",
      "faceLengthMm": 175,
      "foreheadWidthMm": 135,
      "cheekboneWidthMm": 138,
      "jawWidthMm": 132,
      "jawAngleDeg": 118,
      "ratioLengthToWidth": 1.268,
      "ratioCheekToForehead": 1.022,
      "ratioCheekToJaw": 1.045,
      "boundaryResult": {
        "strictSquareRule": "Square (jaw width >95% of cheekbones)",
        "softRoundRule": "Round (jaw angle >115 degrees softer curve)",
        "conflictCause": "Angular threshold versus width threshold diverge on soft-corner jaws"
      }
    },
    {
      "id": "CASE-OVAL-OBLONG",
      "description": "Elongated proportions straddling the 1.50 ratio threshold",
      "faceLengthMm": 205,
      "foreheadWidthMm": 130,
      "cheekboneWidthMm": 135,
      "jawWidthMm": 118,
      "jawAngleDeg": 125,
      "ratioLengthToWidth": 1.519,
      "ratioCheekToForehead": 1.038,
      "ratioCheekToJaw": 1.144,
      "boundaryResult": {
        "strictOblongRule": "Oblong (length-to-width ratio >1.50)",
        "softOvalRule": "Oval (tapered jawline and gentle contour)",
        "conflictCause": "Ratio is 1.518; a 3mm difference in chin point shifts ratio below 1.50"
      }
    }
  ]
}