mosquito / tagz / 27625487046

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Reject dunder attribute access on HTML factory

`HTMLBase.__getattr__` happily invented tag classes for any name,
including ``__qualname__``, ``__name__``, ``__wrapped__`` etc. Sphinx
9.1's autodoc probes these, gets back a class instead of a string,
and the docs build dies with::

    type object 'TagQualname' has no attribute 'rpartition'

Fix: any name starting with ``_`` raises ``AttributeError``. This is
the right shape for introspection tools (sphinx-autodoc, pickle,
IDE hover, dir/repr machinery) — they all rely on `AttributeError`
to mean "not present". The underscore filter does NOT affect the
``snake_case → hyphenated`` mapping for real tags (covered by a
regression test).

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541 of 552 relevant lines covered (98.01%)

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