Fix space generation location and IFC2X3 B-rep

Two fixes for space generation:

1. IFC2X3 schema: build_brep_space now falls back to plain
   IfcRelSpaceBoundary because IfcRelSpaceBoundary1stLevel does not exist in
   IFC2X3.

2. Geometry location: set_space_representation_from_polygon now aligns the
   IFC ObjectPlacement with the Blender object, converts base_z/planes and
   the footprint polygon to the object's local coordinate system before
   building, and fixes the base_z unit scale. The centred-cube regeneration
   test was updated to check world bounds because the mesh is now placed
   relative to the object placement.

Generated with the assistance of an AI coding tool.

src/ifcopenshell-python/ifcopenshell/util/space.py

@@ -565,8 +565,11 @@ def build_brep_space(
     ifcopenshell.api.geometry.assign_representation(ifc_file, product=space, representation=seed_rep)
 
     local_shapes = _build_local_shapes(ifc_file)
+    boundary_class = "IfcRelSpaceBoundary1stLevel"
+    if ifc_file.schema == "IFC2X3":
+        boundary_class = "IfcRelSpaceBoundary"
     boundaries = ifcopenshell.util.boundary.auto_generate_boundaries(
-        ifc_file, space, local_shapes, boundary_class="IfcRelSpaceBoundary1stLevel"
+        ifc_file, space, local_shapes, boundary_class=boundary_class
     )
     if isinstance(boundaries, str) or not boundaries:
         ifcopenshell.api.geometry.remove_representation(ifc_file, representation=seed_rep)

src/ifcopenshell-python/test/util/test_space.py

@@ -24,6 +24,7 @@ import ifcopenshell.util.shape
 import ifcopenshell.util.space as subject
 import math
 import numpy as np
+import os
 import pytest
 import shapely
 import test.bootstrap
@@ -320,3 +321,24 @@ class TestBuildBrepSpace(test.bootstrap.IFC4):
         item = subject.build_brep_space(self.file, space, shapes, shapely.box(-4, -4, 4, 4), 0.0)
         assert item is not None
         assert item.is_a("IfcFacetedBrep") or item.is_a("IfcPolygonalFaceSet")
+
+
+class TestBuildBrepSpaceIfc2x3:
+    def test_build_brep_space_on_ifc2x3_uses_rel_space_boundary(self):
+        # IFC2X3 does not have IfcRelSpaceBoundary1stLevel; build_brep_space must
+        # fall back to plain IfcRelSpaceBoundary without raising a schema error.
+        # We use the real IFC2X3 fixture because the installed wrapper in this
+        # environment has a quirk with synthetic IFC2X3 geometry creation.
+        path = os.path.join(
+            os.path.dirname(__file__),
+            "..",
+            "IfcRelSpaceBoundary_TestFiles",
+            "IfcRelSpaceBoundary2ndLevel",
+            "HouseWithGarage_AC22_IFC2X3.ifc",
+        )
+        ifc_file = ifcopenshell.open(path)
+        space = ifc_file.by_type("IfcSpace")[0]
+        shapes = _build_shapes_dict(ifc_file, ifc_file.by_type("IfcWall") + ifc_file.by_type("IfcSlab"))
+        item = subject.build_brep_space(ifc_file, space, shapes, shapely.box(-1, -1, 1, 1), 0.0)
+        assert item is not None
+        assert item.is_a("IfcFacetedBrep") or item.is_a("IfcPolygonalFaceSet")