refactor: update depth cutout and surface handling for improved geometry manipulation and clarity

tests/conftest.py

@@ -1,5 +1,10 @@
 """Expose the extension and standalone server packages to the test suite."""
 import sys
+
+# Import the pinned dependencies before bpy prepends Blender's extension
+# site-packages, where a half-removed install can shadow the project's own scipy.
+import scipy  # noqa: F401
+
 from tests.support.paths import PROJECT_ROOT
 
 sys.path[:0] = [str(PROJECT_ROOT / "src"), str(PROJECT_ROOT / "src/anyimage")]