{
  "round": 3,
  "transfer_project": {
    "title": "Household Shelf Extrusion Transfer",
    "goal": "Apply extrusion logic to create a valid solid for a bookshelf design using harmless household materials.",
    "inputs": [
      {"type": "vector_2d", "name": "base_profile"},
      {"type": "scalar", "name": "extrusion_distance"}
    ],
    "steps": [
      "Define the base profile with explicit origin, axes, and units in millimeters.",
      "Extrude the constrained geometry along a specified axis to form a closed solid.",
      "Validate that all faces are manifold and normals point outward without self-intersection."
    ],
    "outputs": [
      {"type": "solid_mesh", "name": "shelf_geometry"},
      {"type": "boolean_flag", "name": "validity_check"}
    ],
    "acceptance_criteria": [
      "The output solid must have exactly zero non-manifold edges and no self-intersecting faces.",
      "All face normals must be consistently outward-facing relative to the defined coordinate system."
    ]
  },
  "boundary_cases": {
    "minimum": {"value": 1.0, "unit": "mm", "description": "Minimum extrusion distance ensuring a closed volume exists."},
    "nominal": {"value": 50.0, "unit": "mm", "description": "Standard design length for the household shelf component."},
    "maximum": {"value": 200.0, "unit": "mm", "description": "Maximum safe dimension before structural instability or tool limits are reached.",
      "invalid": {
        "condition": "negative_distance_or_zero_volume",
        "reason": "Extrusion distance must be strictly positive to generate a valid closed solid; zero results in no volume."
      }