chore: Fix 194 Ruff linting errors in tests

- Remove unused variables (F841)
- Rename unused loop variables to _ (B007)
- Add noqa comments for intentional patterns (F401, E402)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: silversurfer562

tests/integration/test_api_endpoints 2.py

@@ -26,7 +26,7 @@ def reset_monitor(self):
 
     def test_init_registers_with_monitor(self):
         """Test cache registration with CacheMonitor"""
-        cache = PatternMatchCache(max_size=500)
+        PatternMatchCache(max_size=500)
 
         monitor = CacheMonitor.get_instance()
         stats = monitor.get_stats("pattern_match")
@@ -37,8 +37,8 @@ def test_init_registers_with_monitor(self):
 
     def test_init_handles_duplicate_registration(self):
         """Test that duplicate registration doesn't raise error"""
-        cache1 = PatternMatchCache(max_size=500)
-        cache2 = PatternMatchCache(max_size=1000)  # Should not raise
+        PatternMatchCache(max_size=500)
+        PatternMatchCache(max_size=1000)  # Should not raise
 
         # Should have been registered once with first max_size
         monitor = CacheMonitor.get_instance()
@@ -256,7 +256,7 @@ def test_get_or_compute_with_none_result(self):
         assert result is None
 
         # Second call should compute again (None is not cached effectively)
-        result2 = cache.get_or_compute(context, compute_fn)
+        cache.get_or_compute(context, compute_fn)
         assert compute_fn.call_count == 2
 
     def test_large_cache_performance(self):
@@ -518,8 +518,8 @@ def test_cache_hit_rate_calculation(self):
 
     def test_multiple_cache_instances_share_monitor(self):
         """Test that multiple cache instances register with same monitor"""
-        cache1 = PatternMatchCache(max_size=100)
-        cache2 = PatternMatchCache(max_size=200)
+        PatternMatchCache(max_size=100)
+        PatternMatchCache(max_size=200)
 
         monitor = CacheMonitor.get_instance()