Update explanation.txt #13

	# .github/workflows/ci.yml
	name: CI

	on:
	push:
	pull_request:

	permissions:
	contents: read

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

	jobs:
	shellcheck:
	name: ShellCheck
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v6 # :contentReference[oaicite:0]{index=0}
	- name: Run ShellCheck
	uses: ludeeus/action-shellcheck@2.0.0 # :contentReference[oaicite:1]{index=1}

	bats:
	name: Bats (${{ matrix.os }})
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest, macos-latest]
	defaults:
	run:
	shell: bash
	steps:
	- name: Checkout
	uses: actions/checkout@v6 # :contentReference[oaicite:2]{index=2}

	- name: Setup Bats and bats libs
	id: setup-bats
	uses: bats-core/bats-action@3.0.1 # :contentReference[oaicite:3]{index=3}

	- name: Run Bats tests
	env:
	BATS_LIB_PATH: ${{ steps.setup-bats.outputs.lib-path }}
	TERM: xterm
	run: \|
	set -euo pipefail
	if [[ -d "test" \|\| -d "tests" ]]; then
	args=()
	[[ -d "test" ]] && args+=("test")
	[[ -d "tests" ]] && args+=("tests")
	bats -r "${args[@]}"
	else
	echo "No ./test or ./tests directory found (expected Bats tests there)."
	exit 1
	fi

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