Migrate to uv, setuptools-scm, prek, and ruff

[rtibbles]

Summary

Migrate Kolibri's Python tooling from pip/tox/setup.py to uv, and replace flake8+black with ruff.

• Dev environments use uv sync --group dev for venv creation, Python version management, and dependency installation
• Versioning handled by setuptools-scm (replaces custom kolibri/utils/version.py generation logic)
• Version tests rewritten to use setuptools-scm's versioning code directly, ensuring consistency with our versioning scheme (except for dev versioning, which differs)
• CI test workflows use uv for Python 3.8+; EOL Python (3.6, 3.7) remains on Docker containers with pip
• Build pipeline uses uv pip install --python-version 3.6 for staticdeps — no Python 3.6 runtime needed
• PEX build uses uvx for isolated pex execution — no separate venv or requirements file needed
• Pre-commit replaced with prek; flake8, black, reorder-python-imports replaced with ruff
• Removed docker/build_whl.dockerfile and requirements/build.txt — uv handles the isolation that previously required Docker

References

• Migrate morango to uv for package management morango#296
• Include uv.lock in path match check, to ensure we're not breaking CI morango#303

Reviewer guidance

Verified locally:

• make dist produces wheel and tarball
• make pex builds PEX using uvx (isolated from dev venv)
• PEX runs correctly in a Python 3.6 container
• Full test suite passes on Python 3.8+ via uv
• Full test suite passes on Python 3.6/3.7 via PYTHONPATH + pip in Docker containers
• Version utility tests (74) pass on 3.8+ via setuptools-scm

For review:

• The ruff reformatting commit touches 367 files — review the config commits individually, not the reformat
• CI is the main verification — check that all workflow jobs pass across the Python version matrix
• The Python unit tests for EOL Python versions (3.8) required check has moved to the modern job — branch protection will need updating

AI usage

This PR was authored collaboratively with Claude Code. Claude implemented the migration based on a brainstormed design, with each decision reviewed and approved interactively.

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.19.4.dev388_gc7c84b44a.d20260415.pex
Windows Installer (EXE)	kolibri-0.19.4.dev388+gc7c84b44a.d20260415-windows-setup-unsigned.exe
Debian Package	kolibri_0.19.4.dev388+gc7c84b44a-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.19.4.dev388+gc7c84b44a.d20260415.dmg
Android Package (APK)	kolibri-0.19.4.dev388+gc7c84b44a.d20260415-0.1.10-debug.apk
Raspberry Pi Image	kolibri-pi-image-0.19.4.dev388+gc7c84b44a.zip
TAR file	kolibri-0.19.4.dev388+gc7c84b44a.d20260415.tar.gz
WHL file	kolibri-0.19.4.dev388+gc7c84b44a.d20260415-py3-none-any.whl

Smoke test screenshot

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