{
  "scope": "Offline kinematic replay only; no real-hand dynamics or physical contact validation.",
  "reference": "Screen-guided imitation of ORCA reference poses; not measured human joint ground truth.",
  "data": {
    "source_records": 223,
    "training_records": 155,
    "reserved_test_records": 50,
    "diagnostic_records": 5
  },
  "baseline": {
    "reference_joint_rmse_deg": 23.55690977309343,
    "ik_target_error_mm": 2.837621385504745,
    "final_reference_error_mm": 32.220885256276695
  },
  "weak_posture_prior": {
    "reference_joint_rmse_deg": 23.196120876206713,
    "ik_target_error_mm": 2.863067256814224,
    "final_reference_error_mm": 32.05125725002484
  },
  "validation_policy": "Reserved poses are excluded from fitting and model selection; repeated pose groups held out together."
}