Explicitly acknowledge _missing_ override in UnknownEnumMixin

[Copilot]

The UnknownEnumMixin._missing_ method overrides StrEnum._missing_ but lacked explicit acknowledgment, causing type checker ambiguity about the intentional override in the mixin pattern.

Changes

• Added # type: ignore[override] to _missing_ method signature
• Enhanced docstring to document the intentional override of StrEnum._missing_
• Removed unused Any import

Context

Mixin classes can't use @override decorator since they don't directly inherit from the classes they'll be mixed with. The type ignore annotation is the standard pattern for acknowledging overrides in mixins.

class UnknownEnumMixin:
    @classmethod
    def _missing_(cls, value: object) -> Self:  # type: ignore[override]
        """Return `UNKNOWN` and log unrecognized values.

        Intentionally overrides `StrEnum._missing_` to provide UNKNOWN fallback.
        """
        # ... implementation

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[Copilot]

Pull request overview

This PR improves type checker clarity for the UnknownEnumMixin._missing_ method by explicitly acknowledging its intentional override of the base enum _missing_ method. The change addresses type checker ambiguity in mixin patterns where the @override decorator cannot be used.

Changes:

• Added # type: ignore[override] annotation to _missing_ method to silence type checker warnings about override in mixin pattern
• Enhanced docstring to document the intentional override behavior
• Removed unused Any import from typing module

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