Save verified native IFC import and user validation evidence

Real IFC2X3/IFC4 import tested. Full BIM authoring/export remains out of scope; 349-second building import performance remains to optimize.

freecad-source/src/WebAssembly/FreeCADCoreProbe/WebOpenCommand.h

@@ -28,6 +28,12 @@ try:
     # Reuse the Part registrations from Mod/Part/Init.py. STEP with colors
     # belongs to Import, not a geometry-only substitute in another module.
     import Part
+    try:
+        import IfcOpenShellNative
+        if not App.getImportType('ifc'):
+            App.addImportType('Industry Foundation Classes (*.ifc *.IFC)', 'IfcOpenShellNative')
+    except ImportError:
+        pass
     try:
         import Mesh
         if not App.getImportType('obj'): App.addImportType('Wavefront OBJ (*.obj *.OBJ)', 'Mesh')