feat(cadfs): expand reconstruction capability coverage

cadfs_to_cdsl/compare.py

@@ -24,7 +24,15 @@ def _assess(report: dict[str, Any], limits: dict[str, float]) -> dict[str, Any]:
 
 
 def compare_steps(gold_step: Path, rebuilt_step: Path, *, surface_tessellation_mm: float = 0.05) -> dict[str, Any]:
-    from onshape_to_cdsl.compare import strict_compare
+    # ``onshape_to_cdsl`` is a sibling src-layout package.  CADFS commands
+    # intentionally require only ``PYTHONPATH=backend:.`` so they must work
+    # from a source checkout as well as an installed package.
+    try:
+        from onshape_to_cdsl.compare import strict_compare
+    except ModuleNotFoundError as error:
+        if error.name != "onshape_to_cdsl.compare":
+            raise
+        from onshape_to_cdsl.src.onshape_to_cdsl.compare import strict_compare
     raw = strict_compare(
         gold_step,
         rebuilt_step,