Summary

Replaces uv-managed .venv with Nix-managed Python environments using uv2nix. This provides fully reproducible builds with dependencies cached in the Nix store.

What Changed

• flake.nix: Add uv2nix, pyproject-nix, and pyproject-build-systems inputs
• devShells: Create shells for Python 3.11 and 3.13 (default, python311, python313)
• Build overrides: Add setuptools for pypika, editables for stackone-ai
• CI: Update matrix to use nix develop .#pythonXXX instead of uv sync
• setup-nix action: Simplify with gc-max-store-size: 4G for cache management
• justfile: Add lint-fix alias

Why

• Reproducibility: All dependencies are now managed by Nix store with hash-based caching
• Faster CI: No need for uv sync step; dependencies are cached with other Nix derivations
• Multi-version support: Easy to test against Python 3.11 and 3.13 via devShells
• Backward compatible: uv run commands still work for non-Nix users

Notes

• The .venv directory is no longer needed (can be deleted locally)
• Use nix develop (default) or nix develop .#python313 for specific versions

Summary by cubic

Switches Python dependency management to Nix via uv2nix, replacing the uv-managed .venv. Builds are now reproducible, CI is faster with versioned, lockfile-scoped cache keys, and ty runs correctly in Nix shells via VIRTUAL_ENV.

• New Features

  • Nix-managed envs from uv.lock using uv2nix; deps cached in the Nix store.
  • Dev shells and packages for Python 3.11 and 3.13 (default, python311, python313).
  • Build overrides: setuptools for pypika; editables for stackone-ai. CI uses nix develop .#pythonXXX with cache keys scoped by Python version and flake.lock/uv.lock; setup-nix restores per-version caches and limits store size.

• Migration

  • Remove your local .venv. Use nix develop (or nix develop .#python313) for a specific version.
  • uv run still works for non-Nix users; commands auto-prefix uv outside Nix shells.

^{Written for commit 10475d3. Summary will update on new commits.}