Lint pass: add ruff config, remove dead imports/vars, wire into CI #3

	name: CI

	on:
	push:
	branches: ['**']
	pull_request:
	branches: ['**']

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.12'
	cache: 'pip'

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt
	pip install ruff

	- name: Lint (ruff)
	run: ruff check src generate.py tests

	- name: Compile all source (syntax check, not fake-green)
	run: python -m compileall -q src generate.py

	- name: Run test suite
	env:
	MPLBACKEND: Agg
	run: python -m pytest -v

	- name: Smoke-run the full generator
	env:
	MPLBACKEND: Agg
	run: \|
	python generate.py > /dev/null
	# At least one PNG must be produced per gallery type.
	test -f output/mandala_01_erdos.png
	test -f output/landscape_01_scalefree.png
	test -f output/flow_01_vortex.png
	test -f output/portrait_western.png
	test -f output/heatmap_01_scalefree.png
	echo "All gallery types produced output."

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