Multiple bug fixes #26

	name: "Black – code-style check"

	on:
	pull_request:
	paths: ["*/.py"]
	push:
	branches: [main]
	paths: ["*/.py"]

	jobs:
	black:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4

	# ---------- pip wheel cache ----------
	- name: Cache pip
	uses: actions/cache@v4
	with:
	path: ~/.cache/pip
	key: ${{ runner.os }}-black-pip-${{ hashFiles('pyproject.toml') }}
	restore-keys: \|
	${{ runner.os }}-black-pip-

	# ---------- Black cache (formatting state) ----------
	- name: Cache Black .cache
	uses: actions/cache@v4
	with:
	path: .cache/black
	key: ${{ runner.os }}-black-${{ github.sha }}
	restore-keys: \|
	${{ runner.os }}-black-

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.13"

	- name: Install Black (pinned)
	run: \|
	python -m pip install --upgrade pip
	pip install black==24.10.0

	- name: Run Black in check mode
	run: black --check --diff src

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