test(cuda.core): skip POSIX IPC handle test on Windows

The allocation-handle constructor is intentionally unsupported on Windows, so limit its close-state test to supported platforms.

Author: Andy-Jost

cuda_core/tests/memory_ipc/test_errors.py

@@ -56,6 +56,7 @@ def test_ipc_allocation_handle_rejects_negative_fd():
         IPCAllocationHandle._init(-1, None)
 
 
+@pytest.mark.skipif(os.name == "nt", reason="IPC allocation handles are not supported on Windows")
 @pytest.mark.agent_authored(model="gpt-5.6")
 def test_ipc_allocation_handle_truth_tracks_close():
     read_fd, write_fd = os.pipe()