fix: Add basic test for hanzo package to fix CI

- Added simple import test to ensure package works
- Fixes 'no tests found' error in CI

pkg/hanzo/tests/test_hanzo.py

@@ -0,0 +1,13 @@
+"""Basic tests for hanzo package."""
+
+
+def test_import():
+    """Test that hanzo package can be imported."""
+    import hanzo
+    assert hanzo is not None
+
+
+def test_cli_exists():
+    """Test that CLI module exists."""
+    import hanzo.cli
+    assert hanzo.cli is not None