Add PyPI packaging (cleo-pm) and automated GitHub Releases

[devin-ai-integration]

Summary

Adds automatic publishing so Cleo reaches more users via pip install cleo-pm and GitHub Releases.

What's included:

• pyproject.toml — Declares cleo-pm as a PyPI package using setuptools + setuptools-scm (version derived automatically from git tags like v0.2.1). Console entry point cleo maps to tools/cleo.py:main_cli().
• tools/__init__.py — Makes tools/ a proper Python package so setuptools can map it as cleo_pm.
• tools/cleo.py — Added main_cli() wrapper for the console_scripts entry point.
• .github/workflows/release.yml — On v* tag push: runs the full test matrix, builds sdist + wheel, publishes to PyPI via trusted publishing (OIDC, no API token needed), and creates a GitHub Release with auto-generated notes + attached dist files.
• README.md — Added pip install cleo-pm as the primary install method + PyPI badge.

After merging, you need to do one setup step on PyPI:

1. Go to https://pypi.org/manage/account/publishing/ (create an account if needed)
2. Add a "pending publisher" for package cleo-pm, owner Surt, repo cleo, workflow release.yml, environment pypi
3. Also create a GitHub environment called pypi at https://github.com/Surt/cleo/settings/environments

Then git tag v0.3.0 && git push origin v0.3.0 will automatically publish to PyPI and create a GitHub Release.

Review & Testing Checklist for Human

• Verify the PyPI package name cleo-pm is available at https://pypi.org/project/cleo-pm/ — if taken, rename in pyproject.toml and README.md
• Set up PyPI trusted publisher (see instructions above) before tagging your next release
• Create a GitHub environment named pypi at https://github.com/Surt/cleo/settings/environments
• After setup, test the full flow: git tag v0.3.0 && git push origin v0.3.0 and verify the release appears on both PyPI and GitHub Releases

Notes

• The existing cleo bash/cmd wrappers and standalone CLI usage are unchanged — this is purely additive.
• setuptools-scm derives the version from git tags automatically, so no need to manually edit version numbers in pyproject.toml.
• The name cleo is taken on PyPI (used by the Poetry ecosystem), so cleo-pm is used instead. The CLI command is still cleo.

Link to Devin session: https://app.devin.ai/sessions/0e86578a44ae49b6a56e3579132c05fe
Requested by: @Surt

[devin-ai-integration]

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