OP-3468: Python 3.10 - 3.14 support

[jpogozelski-xoi]

No description provided.

[Copilot]

Pull request overview

This PR modernizes the project for Python 3.10–3.14 by migrating packaging/tooling to pyproject.toml + uv, updating CI and pre-commit to use uv, and making small typing/import adjustments for newer Python versions.

Changes:

• Replace legacy setup.py/Pipenv workflow with pyproject.toml (Hatchling) + uv.lock dependency locking.
• Update GitHub Actions and pre-commit hooks to run mypy/pytest/pylint via uv across a Python 3.10–3.14 matrix.
• Update internal imports/type hints (collections.abc imports, PEP 604 unions) and expose a defined public API via __all__.

Reviewed changes

Copilot reviewed 14 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
uv.lock	Adds uv lockfile with Python 3.10–3.14 resolution markers.
pyproject.toml	Introduces PEP 621 project metadata, dev dependency groups, and Hatchling build backend.
setup.py	Removes setuptools-based build config in favor of pyproject.toml.
Pipfile / Pipfile.lock	Removes Pipenv dependency management.
env_runner.py	Removes Pipenv-specific runner script.
mise.toml	Adds mise tool config pinning uv.
.python-version	Adds a pinned default local Python version (3.10.20).
.pre-commit-config.yaml	Switches Black repo, updates yamllint, and runs pylint/mypy via uv.
.github/workflows/unit-test.yml	Converts CI to a Python 3.10–3.14 matrix using uv.
.github/workflows/publish.yml	Switches release build/publish steps to uv build / uv publish.
purify/purify.py	Updates typing imports and annotations for 3.10+.
tests/purify_test.py	Uses collections.abc.Sequence for typing in 3.10+.
purify/__init__.py	Defines __all__ for explicit public API exports.
purify/__about__.py	Changes version source to importlib.metadata.
.gitignore	Stops ignoring pyproject.toml and .python-version; fixes .DS_Store entry formatting.
.flake8	Expands ignored rules to accommodate new formatting/ellipsis usage.

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[Copilot]

importlib.metadata.version("purify") will raise PackageNotFoundError when importing from a source checkout where the distribution metadata isn't installed (e.g., running tests with PYTHONPATH=. or python -c 'import purify' before installing). Consider wrapping this in a try/except with a safe fallback (e.g., "0+unknown"), or keeping a static __version__ that matches pyproject.toml to avoid import-time failures.

Suggested change

	__version__ = importlib.metadata.version("purify")
	try:
	__version__ = importlib.metadata.version("purify")
	except importlib.metadata.PackageNotFoundError:
	__version__ = "0+unknown"