fix: resolve ruff linting errors

- Remove unused variables in benchmark scripts
- Rename unused loop variables to follow convention

benchmarks/financebench/evaluate_financebench.py

@@ -322,7 +322,7 @@ class FinanceBenchEvaluator:
 
         for query in test_queries:
             start_time = time.time()
-            search_results = non_compact_searcher.search(
+            _ = non_compact_searcher.search(
                 query, top_k=3, complexity=complexity, recompute_embeddings=False
             )
             search_time = time.time() - start_time
@@ -334,7 +334,7 @@ class FinanceBenchEvaluator:
 
         for query in test_queries:
             start_time = time.time()
-            search_results = compact_searcher.search(
+            _ = compact_searcher.search(
                 query, top_k=3, complexity=complexity, recompute_embeddings=True
             )
             search_time = time.time() - start_time
@@ -802,7 +802,7 @@ def main():
             print(
                 f"  Non-compact index: {non_compact_size_metrics['total_with_embeddings']:.1f} MB"
             )
-            size_increase = (
+            _ = (
                 (
                     non_compact_size_metrics["total_with_embeddings"]
                     - compact_size_metrics["total_with_embeddings"]