lighteval

672f6940 - Fix: Assign SummaCZS instance to `self.summac` in Faithfulness metric (#795)

Fix: Assign SummaCZS instance to `self.summac` in Faithfulness metric (#795) Previously, the SummaCZS model was instantiated but not assigned, causing `self.summac` to remain `None` and leading to runtime errors during scoring. This fix ensures the model is correctly cached in `self.summac`.