test: add reproducible FreeCAD golden oracle

fixtures/freecad-golden/scenarios/part-cut-through-hole.json

@@ -0,0 +1,20 @@
+{
+  "schemaVersion": 1,
+  "id": "part-cut-through-hole",
+  "category": "Part",
+  "description": "20 mm cube cut by a centered radius 5 mm through cylinder",
+  "operation": {
+    "type": "cut",
+    "base": { "type": "box", "length": 20, "width": 20, "height": 20 },
+    "tool": { "type": "cylinder", "radius": 5, "height": 20, "angle": 360, "placement": { "translation": [10, 10, 0] } }
+  },
+  "tolerance": { "linear": 1e-7, "scalar": 1e-7 },
+  "expected": {
+    "shapeType": "Compound",
+    "isNull": false,
+    "isValid": true,
+    "solids": 1,
+    "volume": 6429.203673205104,
+    "boundingBox": { "min": [0, 0, 0], "max": [20, 20, 20] }
+  }
+}