Add GitHub workflows

[marcleblanc2]

Summary

• add CI workflow for lockfile, lint, typecheck, tests, wheel build, and install smoke test
• add release workflow for tagged wheel releases with checksum and release notes

Verification

• uv lock --check
• npx --yes markdownlint-cli2
• uv run --python 3.13 --frozen ruff check .
• uv run --python 3.13 --frozen ruff format --check .
• uv run --python 3.13 --frozen pyright
• uv run --python 3.13 --frozen python -m unittest discover -s tests
• Python 3.13 source and installed-wheel import smoke tests