[python 3.14] Metaclasses: interact with annotations from `namespace` dict

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If this ever helps someone, for now I use the following

from annotationlib import Format, call_annotate_function  # type: ignore[import-not-found]
from typing import cast

def get_namespace_annotations(namespace: dict[str, object]) -> dict[str, object]:
    """Get annotations from a namespace dict in python3.14."""
    __annotations__ = cast("dict[str, object] | None", namespace.get("__annotations__"))
    __annotate__ = namespace.get("__annotate__")

    if __annotations__ is None:
        if __annotate__ is None:
            return {}
        return call_annotate_function(__annotate__, Format.FORWARDREF)

    # Avoid bad synchronization, suppress `__annotate__`
    if __annotate__ is not None:
        namespace["__annotate__"] = None

    return __annotations__

which seems to work but does not sanitize __annotate__ and __annotations__.