{
  "schemaVersion": 1,
  "id": "invalid-helix-family-001",
  "category": "Part",
  "description": "Helix missing pitch rejection",
  "operation": { "type": "helix", "height": 6, "radius": 2, "angle": 0, "segmentLength": 0 },
  "expectedError": "pitch"
}
