fix(cuda.core): make AccessedBySetProxy.discard a no-op on NUMA-host inputs

`MutableSet.discard(x)` is contractually a no-op when `x` is not in the
set. `set_accessed_by` only accepts `device` and generic `host` kinds, so
NUMA-aware host variants (`Host(numa_id=...)`, `Host.numa_current()`)
can never enter the set — they are necessarily non-members.

Previously, `discard` forwarded such inputs to `_advise_one`, which
raised `ValueError` from the kind-allowed check. That broke the
`MutableSet` contract that `AccessedBySetProxy` claims by inheriting
from `MutableSet`, and caused `test_accessed_by_mutable_set_interface`
to fail on the helper's non-member sentinel.

Add an explicit short-circuit for the NUMA-host kinds.

Fixes CI failure for tests/memory/test_managed_ops.py::TestManagedBuffer::test_accessed_by_mutable_set_interface.

Author: rparolin

cuda_core/cuda/core/_memory/_managed_buffer.py

@@ -103,9 +103,18 @@ def add(self, location: Device | Host) -> None:
         _advise_one(self._buf, _SET_ACCESSED_BY, location)
 
     def discard(self, location: Device | Host) -> None:
-        """Apply ``unset_accessed_by`` advice for ``location``."""
+        """Apply ``unset_accessed_by`` advice for ``location``.
+
+        Per the ``MutableSet`` contract, ``discard`` is a no-op for elements
+        not in the set. ``set_accessed_by`` only accepts ``Device`` and the
+        generic ``Host()`` — NUMA-aware host variants (``Host(numa_id=...)``,
+        ``Host.numa_current()``) can never enter the set, so discarding them
+        is silently ignored rather than forwarded to the driver.
+        """
         if not isinstance(location, (Device, Host)):
             return
+        if isinstance(location, Host) and (location.numa_id is not None or location.is_numa_current):
+            return
         _advise_one(self._buf, _UNSET_ACCESSED_BY, location)
 
     def __repr__(self) -> str: