[jaypantone]

Make Python 3.15 primary for linting, type checking, packaging, and Linux/macOS/Windows tests. Keep Linux compatibility coverage for CPython 3.11–3.14 and PyPy 3.11, and add a required stable PyPy 3.12 job.

Drop CPython and PyPy 3.10 support for the next release: require Python >=3.11, update package classifiers, target Python 3.11 in Black, and document the change. Runtime dependencies are unchanged.

Update checkout and setup-python to v7 in both workflows, add pip caching, cancellation of superseded runs, manual dispatch, read-only workflow permissions, a 60-minute job timeout, and weekly Dependabot updates for Actions. Require tox 4, forward pytest arguments, and run pip check/freeze inside test environments. Add pycparser and setuptools only on PyPy to satisfy its bundled cffi/HPy dependencies. Align the Black pre-commit pin with tox and avoid installing the package in the formatting environment.

Validation:

• Python 3.15: all 555 tests passed.
• PyPy 3.12: all 555 tests passed.
• Flake8, mypy, pylint, and Black pass on Python 3.15; actionlint passes.
• Python 3.15 builds both the wheel and source distribution; twine check passes for both. Built metadata confirms Python >=3.11.
• Verified that all 13 CI jobs map to tox environments and that runtime dependencies are unchanged.

All 13 jobs in the hosted PR matrix pass, including CPython 3.11–3.15, PyPy 3.11/3.12, and Python 3.15 on Linux, macOS, and Windows.

[ulfarsson]

These are almost exclusively numbered updates on things we are already doing. Looks good.

[ulfarsson]

Maybe the tox lines 59-67 in the readme are a bit too verbose