REF: Upgrade for Sphinx >=9.0, setuptools 80.9.0, Python 3.14#34

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westurner wants to merge 3 commits intotell-k:masterfrom

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Commits on Jan 8, 2026

REF: layout.hml: Fix `'style' variable undefined` error for Sphinx >= 7.x, `cssfile.filename` and `scriptfile.filename` for >= 9.0.
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BLD: setup.py,setup.cfg: get `python setup.py test` to run" -m "note that tests_require=[pytest-runner] was removed due to setuptools deprecation warnings
westurner
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BLD: setup.py,tox.ini: upgrade py versions, fix sphinx deprecation warnings: license str, remove namespace_packages
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