Make temperature threshold checks forward-compatible (#2488)

Compare raw NVML device architecture values so architectures newer than the generated DeviceArch enum do not raise ValueError before the threshold query. Add regression coverage for an unrecognized architecture value.

Author: rwgk

cuda_core/cuda/core/system/_temperature.pxi

@@ -173,7 +173,9 @@ cdef class Temperature:
             nvml.TemperatureThresholds.TEMPERATURE_THRESHOLD_MEM_MAX,
             nvml.TemperatureThresholds.TEMPERATURE_THRESHOLD_GPU_MAX
         ):
-            device_arch = nvml.DeviceArch(nvml.device_get_architecture(self._handle))
+            # Compare the raw value so newer NVML architecture constants remain
+            # forward-compatible.
+            device_arch = nvml.device_get_architecture(self._handle)
             if device_arch >= nvml.DeviceArch.ADA:
                 warnings.warn(
                     f"{threshold_type} is no longer recommended for Ada and later architectures. "

cuda_core/tests/system/test_system_device.py

@@ -722,6 +722,25 @@ def test_temperature():
             assert sensor.default_min_temp <= sensor.current_temp <= sensor.default_max_temp
 
 
+@pytest.mark.thread_unsafe(reason="Temporarily replaces process-global NVML functions")
+@pytest.mark.agent_authored(model="gpt-5.6-sol")
+def test_temperature_threshold_unrecognized_device_arch(monkeypatch):
+    temperature = system.Device(index=0).temperature
+    unrecognized_arch = int(nvml.DeviceArch.UNKNOWN) - 1
+    with pytest.raises(ValueError):
+        nvml.DeviceArch(unrecognized_arch)
+
+    monkeypatch.setattr(nvml, "device_get_architecture", lambda _handle: unrecognized_arch)
+    monkeypatch.setattr(
+        nvml,
+        "device_get_temperature_threshold",
+        lambda _handle, _threshold: 42,
+    )
+
+    with pytest.warns(DeprecationWarning, match="no longer recommended"):
+        assert temperature.get_threshold(typing.TemperatureThresholds.SHUTDOWN) == 42
+
+
 @pytest.mark.agent_authored(model="claude-opus-4.8")
 def test_temperature_arg_validation():
     # Both getters reject an unknown key before issuing any NVML call.