fix(computer_use): honor custom vision routing

tests/tools/test_computer_use_vision_routing.py

@@ -160,6 +160,42 @@ class TestRouteDecision:
                 "some-aggregator", "some-vision-model", {}
             ) is True
 
+    def test_user_declared_vision_support_keeps_custom_provider_native(self):
+        """Local/custom VLMs use config as their tool-result image escape hatch."""
+        from tools.computer_use import vision_routing
+
+        cfg = {
+            "model": {
+                "default": "Qwen3.6-35B-A3B-local-vlm",
+                "provider": "omlx",
+                "supports_vision": True,
+            }
+        }
+        with patch.object(vision_routing,
+                          "_provider_accepts_multimodal_tool_result",
+                          return_value=False):
+            assert vision_routing.should_route_capture_to_aux_vision(
+                "custom", "Qwen3.6-35B-A3B-local-vlm", cfg
+            ) is False
+
+    def test_user_declared_no_vision_routes_custom_provider_to_aux(self):
+        """An explicit false override should not fall through to native routing."""
+        from tools.computer_use import vision_routing
+
+        cfg = {
+            "model": {
+                "default": "local-text-model",
+                "provider": "omlx",
+                "supports_vision": False,
+            }
+        }
+        with patch.object(vision_routing,
+                          "_provider_accepts_multimodal_tool_result",
+                          return_value=True):
+            assert vision_routing.should_route_capture_to_aux_vision(
+                "custom", "local-text-model", cfg
+            ) is True
+
     def test_unknown_provider_capabilities_fail_closed(self):
         """When tool-result lookup returns None, route to aux (safe default)."""
         from tools.computer_use import vision_routing