docs: Upgrade all Module docs to Principal Engineer standard #10


	name: System Design Course CI

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	# 🛑 Concurrency: Cancel previous runs on the same branch
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	test:
	name: Test (Python ${{ matrix.python-version }})
	runs-on: ubuntu-latest
	timeout-minutes: 5 # ⚡ Fail fast if hanging

	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.10", "3.11", "3.12"]

	steps:
	- uses: actions/checkout@v3

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip' # ⚡ Cache pip dependencies automatically

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt
	pip install pylint pytest-xdist # xdist for parallel tests

	- name: Lint (Syntax Check)
	run: \|
	# Only check for fatal errors (E) and syntax warnings (W)
	# We assume 'bad.py' files might have issues, so we treat this as advisory or selective
	# For now, let's just check valid python syntax
	python -m compileall . -q

	- name: Run Tests (Parallel)
	run: \|
	# ⚡ Run tests in parallel (-n auto)
	pytest -n auto tests/

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