{
  "date": "2026-10-21",
  "target_sha256": "f01e8c0b7e2676b2961950b0e48efdd2589af218e4b36de7d39f5d1c76852bfb",
  "claim_type": "static CPU assembly/constants and Metal AIR reconstruction, independently tested; no native-host observation",
  "chin_pins": [
    [
      68,
      38
    ],
    [
      67,
      37
    ],
    [
      66,
      36
    ]
  ],
  "chin_parameter_index": 5,
  "signed_slider_range": [
    -1,
    1
  ],
  "positive_scale": 0.04,
  "negative_scale": 0.02,
  "cpu_evidence": [
    "ev_640ccb714c5ce00d3864844af319fc574d223810dde08443d2ef2e8f1e989c47",
    "ev_8bc31392c07788d2482546121297c3f177d527282275ef21fd3e5edef9921544"
  ],
  "air_sha256": "f97705b88f5491057df2117aef457ffca84e11020574cd57742b0670db4484d8",
  "air_file_local_ignored": "build/pose-analysis/face-thin.air.txt",
  "coordinate_contract": "Vision normalized y-up; upload pins and sampling coordinate converted once to y-down UV, result returned to CI y-up",
  "gain": "clamp(280/max(length((P75-P59)*imageSize),2*length((P67-(P74+P60)/2)*imageSize),1),1,2.25)",
  "pin_formula": "q=clamp(q-(anchor-origin)*ratio*clamp(1-distance(q,origin)/distance(anchor,origin),0,1),0,1)",
  "positive_visual_direction": "chin toward lower lip (shorter)",
  "negative_visual_direction": "chin away from lower lip (longer)",
  "verification": {
    "beauty": 49,
    "face": 116,
    "thin_chin": 394,
    "failures": 0,
    "maximum_uv_oracle_error": 1.09828022e-05
  },
  "limitations": [
    "Seven other shape controls remain approximations.",
    "Combined analytic controls and multi-face resampling order is not fully reference equivalent.",
    "FxPlug adapter imageOrigin handling is under separate investigation.",
    "Motion/FCP final visual validation is reserved for user."
  ]
}