[FanWu-ai]

The menu's Enter handler invokes actions even when their MenuItem has disabled=True. Opening a submenu selects its first child, so Down followed by Enter can run a disabled action; the existing submenu mouse handler already rejects it.

Check the current disabled flag before invoking the handler or changing focus. Menu navigation remains unchanged. Seven new cases cover enabled/disabled actions at three depths and disabling/re-enabling an already selected item.

Validation on Linux / CPython 3.12.14:

• Pristine complete suite: 156 passed; final complete suite: 163 passed.
• Four added cases fail against the original implementation.
• Ruff lint/format, typos, strict mypy for win32/linux/darwin, all 12 pinned hooks, wheel/sdist builds, and git diff --check pass.
• Independent automated review reran the full suite and gates. Packaged implementation bytes match the tested source.

The mypy platform targets are static checks; other interpreter/native OS matrix combinations were not run locally.

Prepared and tested with OpenAI Codex assistance. No human review is claimed.