diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..fe95a5c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,9 @@
+.PHONY: clean build
+
+# Remove build artifacts so stale modules can't leak into the wheel.
+clean:
+	rm -rf build dist *.egg-info datamaxi.egg-info
+
+# Always build from a clean tree (matches the fresh-checkout CI build).
+build: clean
+	python -m build
diff --git a/datamaxi/lib/__init__.py b/datamaxi/lib/__init__.py
new file mode 100644
index 0000000..e69de29