feat(rewards): add RewardComputer wrapper class with __call__ and reset() for injection

rewards/compute_rewards.py

@@ -12,3 +12,10 @@ def compute_rewards(action: Any, attack_history: list[dict], llm_result: dict) -
 def reset_scorer() -> None:
     """Reset Person 2's novelty embeddings."""
     pass
+
+class RewardComputer:
+    def __call__(self, *args, **kwargs):
+        return compute_rewards(*args, **kwargs)
+    
+    def reset(self):
+        reset_scorer()