refac #7

	# ─────────────────────────────────────────────────────────────────────────────
	# Backend CI — Python formatting checks via Ruff
	# Runs on pushes and PRs to main/dev when backend files change
	# ─────────────────────────────────────────────────────────────────────────────
	name: Python CI

	on:
	push:
	branches: [main, dev]
	paths: ['backend/**', 'pyproject.toml', 'uv.lock']
	pull_request:
	branches: [main, dev]
	paths: ['backend/**', 'pyproject.toml', 'uv.lock']

	concurrency:
	group: backend-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	# ── Ruff format check across supported Python versions ───────────────────
	format-check:
	name: Ruff Format (${{ matrix.python-version }})
	runs-on: ubuntu-latest
	timeout-minutes: 10
	strategy:
	fail-fast: false
	matrix:
	python-version: ['3.11', '3.12']
	steps:
	- uses: actions/checkout@v5

	- uses: actions/setup-python@v6
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install formatter
	run: pip install "ruff>=0.15.5"

	- name: Verify formatting
	run: ruff format --check . --exclude .venv --exclude venv

Provide feedback