chore(release): prepare v0.3.1

tests/test_corporate_actions.py

@@ -1,15 +1,18 @@
 from decimal import Decimal
+
 from app.domain.corporate_actions import calculate_stock_consolidation
 
+
 def test_stock_consolidation_preserves_cost_and_scales_wac():
-    result = calculate_stock_consolidation(Decimal("1452"), Decimal("726"), Decimal("1086.23"))
+    result = calculate_stock_consolidation(Decimal(1452), Decimal(726), Decimal("1086.23"))
     assert result.average_price_after == Decimal("2172.46")
     assert result.total_cost_basis == Decimal("1577205.96000000")
     assert result.ratio == Decimal("0.5")
 
 def test_stock_consolidation_rejects_fractional_result():
     import pytest
+
     from app.domain.corporate_actions import CorporateActionError
     with pytest.raises(CorporateActionError) as exc:
-        calculate_stock_consolidation(Decimal("3"), Decimal("1.5"), Decimal("10"))
+        calculate_stock_consolidation(Decimal(3), Decimal("1.5"), Decimal(10))
     assert exc.value.code == "FRACTIONAL_RESULT_UNSUPPORTED"