cuda.core: add docstrings to Host properties and public StrEnum types

[aryanputta]

Summary

Contributes to the doc-finalization step of #2131.

Two doc-only changes to cuda.core, touching no logic:

cuda/core/_host.py — Host property docstrings

Host is a new 1.1.0 API (release notes: #2131 checklist item "Finalize the doc update"). The class-level docstring is already complete, but numa_id and is_numa_current had no docstrings, leaving them blank in generated API docs and help():

@property
def numa_id(self) -> int | None:
    """NUMA node ID, or ``None`` if not pinned to a specific NUMA node."""

@property
def is_numa_current(self) -> bool:
    """Whether this ``Host`` represents the calling thread's NUMA node (constructed via :meth:`numa_current`)."""

cuda/core/typing.py — StrEnum class docstrings

All 11 public StrEnum subclasses (SourceCodeType, ObjectCodeFormatType, CompilerBackendType, PCHStatusType, GraphConditionalType, GraphMemoryType, ManagedMemoryLocationType, VirtualMemoryHandleType, VirtualMemoryLocationType, VirtualMemoryGranularityType, VirtualMemoryAccessType, VirtualMemoryAllocationType) previously had zero class-level docstrings. Each now has a short description and a one-liner per member so help() and Sphinx show meaningful output.

Checklist

• cuda.core only — no cuda.bindings files touched
• No logic changes — docstrings only
• Consistent with existing single-line property docstring style (Host.numa_current, ManagedBuffer methods)

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[aryanputta]

@leofang @rwgk — flagging this for your awareness in the context of #2131.

This is a doc-only contribution to cuda.core (no cuda.bindings files touched — I know external contributions there aren't permitted). Both changes are pure docstring additions, zero logic:

• _host.py: Host.numa_id and Host.is_numa_current were undocumented. Since Host is new in 1.1.0 and explicitly in the release notes, having blank property docs felt like the most directly useful thing I could help with for the doc-finalization step.
• typing.py: added class-level docstrings to all 11 public StrEnum types so help() and Sphinx show something meaningful.

Happy to split into two PRs if that's easier to review, or adjust wording on any of the docstrings.