chore: import upstream snapshot with attribution

tests/test_utils.py

@@ -0,0 +1,15 @@
+"""Tests for specify_cli._utils.run_command."""
+
+from __future__ import annotations
+
+import inspect
+
+import pytest
+
+from specify_cli import run_command
+
+
+def test_run_command_rejects_shell_execution_compatibly():
+    assert inspect.signature(run_command).parameters["shell"].default is False
+    with pytest.raises(ValueError, match="does not support shell=True"):
+        run_command(["echo", "blocked"], shell=True)  # noqa: S604