[claude] Fix 27 ruff lint errors blocking all pushes (#1149) (#1153)

Co-authored-by: Claude (Opus 4.6) <claude@hermes.local>
Co-committed-by: Claude (Opus 4.6) <claude@hermes.local>

tests/infrastructure/test_router_cascade.py

@@ -523,7 +523,7 @@ class TestProviderAvailabilityCheck:
 
     def test_check_vllm_mlx_server_healthy(self):
         """Test vllm-mlx when health check succeeds."""
-        from unittest.mock import MagicMock, patch
+        from unittest.mock import patch
 
         router = CascadeRouter(config_path=Path("/nonexistent"))
 
@@ -567,7 +567,7 @@ class TestProviderAvailabilityCheck:
 
     def test_check_vllm_mlx_default_url(self):
         """Test vllm-mlx uses default localhost:8000 when no URL configured."""
-        from unittest.mock import MagicMock, patch
+        from unittest.mock import patch
 
         router = CascadeRouter(config_path=Path("/nonexistent"))
 
@@ -623,7 +623,7 @@ class TestVllmMlxProvider:
 
     async def test_vllm_mlx_base_url_normalization(self):
         """Test _call_vllm_mlx appends /v1 when missing."""
-        from unittest.mock import AsyncMock, MagicMock, patch
+        from unittest.mock import AsyncMock, patch
 
         router = CascadeRouter(config_path=Path("/nonexistent"))
 
@@ -1059,9 +1059,7 @@ class TestTransformMessagesForOllama:
 
     def test_plain_text_message(self):
         router = self._router()
-        result = router._transform_messages_for_ollama(
-            [{"role": "user", "content": "Hello"}]
-        )
+        result = router._transform_messages_for_ollama([{"role": "user", "content": "Hello"}])
         assert result == [{"role": "user", "content": "Hello"}]
 
     def test_base64_image_stripped(self):
@@ -1204,7 +1202,10 @@ class TestCascadeTierFiltering:
         router = self._make_router()
         with patch("infrastructure.router.cascade._quota_monitor", None):
             with patch.object(router, "_call_anthropic") as mock_call:
-                mock_call.return_value = {"content": "frontier response", "model": "claude-sonnet-4-6"}
+                mock_call.return_value = {
+                    "content": "frontier response",
+                    "model": "claude-sonnet-4-6",
+                }
                 result = await router.complete(
                     messages=[{"role": "user", "content": "hi"}],
                     cascade_tier="frontier_required",