Towncrier-based release system for the setuptools-scm monorepo.

• towncrier-fragments version scheme: Determines version bumps from changelog fragment types
• changelog.d/ directories per project with fragment templates
• GitHub workflows for release proposals and tag creation
• Project-prefixed tags: setuptools-scm-vX.Y.Z, vcs-versioning-vX.Y.Z

Fragment types determine version bumps:

• removal → major bump
• feature, deprecation → minor bump
• bugfix, doc, misc → patch bump

Entry point: vcs_versioning._version_schemes._towncrier:version_from_fragments

Tests: vcs-versioning/testing_vcs/test_version_scheme_towncrier.py

Release Proposal (.github/workflows/release-proposal.yml): Manual trigger, runs towncrier, creates labeled PR

Tag Creation (.github/workflows/create-release-tags.yml): On PR merge, creates tags from PR title, triggers PyPI upload

Modified Upload (.github/workflows/python-tests.yml): Split per-project upload jobs filtered by tag prefix

Contributors: Add changelog fragment to {project}/changelog.d/{number}.{type}.md

Maintainers: Trigger release proposal workflow, review PR, merge to create tags and upload to PyPI

• Version scheme is single source of truth, no custom scripts
• Manual approval via PR review
• Workflows fail explicitly if required data is missing
• Tag prefix filtering controls package uploads

See CONTRIBUTING.md and TESTING.md for details.