ci: add ruff lint, MIT license and CI badges #1

	name: CI

	on:
	push:
	branches: [main]
	pull_request:

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

	jobs:
	lint:
	name: Ruff (lint + format)
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.12"
	cache: pip
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install ruff
	- name: Ruff check
	run: ruff check .
	- name: Ruff format check
	run: ruff format --check .

	build:
	name: Smoke (compile + import)
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: "3.12"
	- name: Compile all Python sources
	run: python -m compileall -q src app.py app_mapas.py 2>/dev/null \|\| python -m compileall -q .
	- name: Import distribution modules
	run: python -c "import sys; sys.path.insert(0, 'src'); import graph_builder; print('graph_builder OK')"

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