feat: add knowledge-driven joint design studio

backend/src/joint_module/step_geometry.py

@@ -220,12 +220,8 @@ def apply_transform(shape, placement: ComponentPlacement):
 def write_compound_step(shapes: dict[str, object], path: Path) -> None:
     if not shapes:
         raise OcpInterferenceError("cannot_write_empty_joint_compound")
+    compound = compound_shape(shapes)
     ocp = _import_ocp()
-    compound = ocp["TopoDS_Compound"]()
-    builder = ocp["BRep_Builder"]()
-    builder.MakeCompound(compound)
-    for shape in shapes.values():
-        builder.Add(compound, shape)
     path.parent.mkdir(parents=True, exist_ok=True)
     writer = ocp["STEPControl_Writer"]()
     writer.Transfer(compound, ocp["STEPControl_AsIs"])
@@ -234,6 +230,18 @@ def write_compound_step(shapes: dict[str, object], path: Path) -> None:
         raise OcpInterferenceError(f"step_write_failed: {path}")
 
 
+def compound_shape(shapes: dict[str, object]):
+    if not shapes:
+        raise OcpInterferenceError("cannot_build_empty_joint_compound")
+    ocp = _import_ocp()
+    compound = ocp["TopoDS_Compound"]()
+    builder = ocp["BRep_Builder"]()
+    builder.MakeCompound(compound)
+    for shape in shapes.values():
+        builder.Add(compound, shape)
+    return compound
+
+
 def detect_interferences_from_placed_shapes(
     shapes: dict[str, object],
     *,
@@ -288,4 +296,3 @@ def detect_interferences_from_placed_shapes(
             )
         )
     return metrics, results
-