strengthen real-case calibration safeguards

tests/test_muntha_module.py

@@ -0,0 +1,10 @@
+from __future__ import annotations
+
+from scripts.muntha import calc_muntha_from_sun_sign
+
+
+def test_standalone_muntha_module_imports_and_calculates() -> None:
+    result = calc_muntha_from_sun_sign(0, 12)
+
+    assert result["muntha_sign"] == 11
+    assert result["muntha_lord"] == "Jupiter"