Add CI status badge to README #3

	name: CI

	# 每次 push 到 main 或開 PR 時，自動跑 repo 內所有 Makefile 的測試。
	on:
	push:
	branches: [main]
	pull_request:
	workflow_dispatch:

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v5

	# 安裝 uv（Python 測試用 `uv run python` 跑，符合專案慣例）
	# 專案沒有 uv.lock / requirements，關掉 cache 避免無效快取警告
	- name: Install uv
	uses: astral-sh/setup-uv@v6
	with:
	enable-cache: false

	# gcc / g++ 在 ubuntu-latest 已預裝；顯示版本方便除錯
	- name: Show toolchain versions
	run: \|
	g++ --version
	gcc --version
	make --version \| head -1
	uv --version

	# 掃描每個 Makefile，挑最適合的 target：
	# 有 test 就 make test；否則有 run 就 make run；再否則只 make（確認能編譯）。
	- name: Run all Makefile tests
	run: \|
	set -euo pipefail
	found=0
	while IFS= read -r mk; do
	found=1
	dir=$(dirname "$mk")
	echo "::group::$dir"
	if grep -qE '^test:' "$mk"; then
	echo ">>> make -C $dir test"
	make -C "$dir" test
	elif grep -qE '^run:' "$mk"; then
	echo ">>> make -C $dir run"
	make -C "$dir" run
	else
	echo ">>> make -C $dir"
	make -C "$dir"
	fi
	echo "::endgroup::"
	done < <(find . -name Makefile -not -path '/node_modules/' \| sort)
	if [ "$found" -eq 0 ]; then
	echo "No Makefile found" >&2
	exit 1
	fi

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