Devenv.nix and justfile

[topher097]

Inclusion of a devenv.nix environment for development in linux. By including this environment, the development system can be hermetic and reproducable. To enter the shell, either use the justfile recipe: just shell, or the command: devenv shell --impure. Note, it may take some time to start the shell the first time, as the shell needs to build the required packages.

The justfile includes basic recipes to run, test, and format files; this is a QoL addition

Summary by Sourcery

Introduce a hermetic Nix-based development environment and streamline project workflows with a Justfile

New Features:

• Add a Nix development environment via devenv.nix, devenv.yaml, and lock file for reproducible builds
• Add a Justfile with recipes for entering the dev shell, running tests, formatting code, and other common tasks

Enhancements:

• Configure pytest options (minversion, cache directory, addopts, test paths) in pyproject.toml

[sourcery-ai]

Reviewer's Guide

This PR sets up a hermetic Linux development environment using Nix (via devenv), integrates Git hooks and Python tooling, introduces a Justfile for common workflows, and refines pytest settings for a reproducible, streamlined developer experience.

File-Level Changes

Change	Details	Files
Configure pytest options in pyproject.toml	Set minimum pytest version to 8.0 Specify cache directory and console output style Add verbose, colorized output flags Define test paths and retention count for tmp_path	pyproject.toml
Add Nix-based hermetic development environment	Create devenv.nix with Python 3.12, uv and just support Enable and configure git-hooks for linting, formatting and security Define environment variables and shell-entry script for project setup Add devenv.yaml and lock file to pin Nix inputs	devenv.nix devenv.yaml devenv.lock
Introduce Justfile for development tasks	Define shell entry, project ownership and Python environment setup recipes Add commands for running app, tests, formatting and docs preview Integrate uv tooling as script interpreter and enable positional arguments Include utilities for git staging, garbage collection and VM management	justfile

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