Implement DFS, restore CI #12

	name: lints and tests
	on: push
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Install Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.13.7"
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install ruff
	pip install pytest
	pip install -r requirements.txt
	# Update output format to enable automatic inline annotations.
	- name: Run Ruff
	run: ruff check --output-format=github .
	continue-on-error: true
	- name: Run pytest
	run: pytest

Provide feedback