Versioning and release automation

[razeghi71]

Add GitHub Actions for automated semver tagging, GitHub releases, and PyPI publishing to streamline the release process.

This PR introduces two GitHub Actions workflows:

• semver-tag-and-release.yml: On PR merge, it reads major/minor/patch labels to compute the next vX.Y.Z tag, pushes it, and creates a GitHub Release with auto-generated notes.
• release-pypi.yml: On v* tag pushes, it builds the package and publishes it to PyPI using the secure OIDC "Trusted Publisher" method.

Additionally, the project's versioning has been switched to be tag-derived via hatch-vcs, removing the need for manual version updates in pyproject.toml and burf/__init__.py. The README.md has been updated with instructions on the new release process and PyPI Trusted Publisher setup.

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Note

Automates releases and shifts versioning to tags.

• Adds semver-tag-and-release.yml to compute vX.Y.Z from PR labels on merge, push the tag, and create a GitHub Release (auto notes)
• Adds release-pypi.yml to build with uv and publish to PyPI via Trusted Publishing (OIDC) on v* tags
• Switches to VCS-derived versions: pyproject.toml now uses dynamic = ["version"], adds hatch-vcs to build-system, and configures [tool.hatch.version]
• Updates burf/__init__.py to read __version__ from importlib.metadata with a fallback for source checkouts
• Adds DEVELOPMENT.md with local setup and the new release process

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