feat: close builder mutation and roundtrip evidence gaps

scripts/freecad-partdesign-base-oracle.py

@@ -4,6 +4,8 @@ import FreeCAD as App
 import Part
 import Sketcher
 
+from freecad_mutation_evidence import capture_property_mutation
+
 
 def version_text():
     return ".".join(str(value) for value in App.Version()[:3])
@@ -46,7 +48,9 @@ def tapered_pad():
     pad.Type = "Length"
     pad.Length = 5.0
     pad.TaperAngle = 5.0
+    mutation = capture_property_mutation(document, pad, "Length", 6.0)
     result = shape_result("pad-tapered", document, pad)
+    result["mutation"] = mutation
     App.closeDocument(document.Name)
     return result
 
@@ -69,7 +73,9 @@ def tapered_pocket():
     pocket.Type = "Length"
     pocket.Length = 10.0
     pocket.TaperAngle = 2.0
+    mutation = capture_property_mutation(document, pocket, "Length", 8.0)
     result = shape_result("pocket-tapered", document, pocket)
+    result["mutation"] = mutation
     App.closeDocument(document.Name)
     return result