Just kidding? Looks like the extension module was needed for CI.

jpburnett · jpburnett · commit e8d617d8d9ba · 2025-11-17T22:54:38.000-08:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -19,3 +19,6 @@ classifiers = [
 [build-system]
 requires = ["maturin>=1.2,<2.0"]
 build-backend = "maturin"
+
+[tool.maturin]
+features = ["pyo3/extension-module", "python_bindings"]
