chore: import upstream snapshot with attribution

tests/python/support/tmp_root.py

@@ -0,0 +1,20 @@
+from __future__ import annotations
+
+import tempfile
+from pathlib import Path
+
+from tests.python.support.paths import REPO_ROOT
+
+TMP_ROOT = REPO_ROOT / "tmp"
+CAD_TEST_TMP_ROOT = TMP_ROOT / "cad-skill-tests"
+
+
+def temporary_directory(*, prefix: str) -> tempfile.TemporaryDirectory[str]:
+    CAD_TEST_TMP_ROOT.mkdir(parents=True, exist_ok=True)
+    return tempfile.TemporaryDirectory(prefix=prefix, dir=CAD_TEST_TMP_ROOT)
+
+
+def named_tmp_root(name: str) -> Path:
+    tmp_root = TMP_ROOT / name
+    tmp_root.mkdir(parents=True, exist_ok=True)
+    return tmp_root