fix(cuda.core): restore CUDA_ERROR_NOT_INITIALIZED auto-init in _query_memory_attrs (R4)

Per Leo's review on PR #1775 (_buffer.pyx:455), restore the auto-init
retry that was removed in 10de998. cuPointerGetAttributes is the
first driver call _query_memory_attrs makes, and a NOT_INITIALIZED
result here would otherwise propagate out of every is_managed /
is_host_accessible / is_device_accessible query before the user has
called any other Device API.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: rparolin

cuda_core/cuda/core/_memory/_buffer.pyx

@@ -36,6 +36,7 @@ else:
 
 from cuda.core._dlpack import classify_dl_device, make_py_capsule
 from cuda.core._utils.cuda_utils import driver
+from cuda.core._device import Device
 
 
 # =============================================================================
@@ -452,6 +453,11 @@ cdef inline int _query_memory_attrs(
 
     cdef cydriver.CUresult ret
     ret = cydriver.cuPointerGetAttributes(3, attrs, <void**>vals, ptr)
+    if ret == cydriver.CUresult.CUDA_ERROR_NOT_INITIALIZED:
+        with cython.gil:
+            # Device class handles the cuInit call internally
+            Device()
+        ret = cydriver.cuPointerGetAttributes(3, attrs, <void**>vals, ptr)
     HANDLE_RETURN(ret)
 
     # TODO: HMM/ATS-enabled sysmem should also report is_managed=True; the