Merge pull request #21 from JLay2026/feat/optional-preview #44

	---
	name: CI

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

	jobs:
	lint:
	name: ruff
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: '3.11'
	cache: pip
	- name: Install ruff
	run: pip install ruff
	- name: Lint
	run: ruff check src/ tests/

	pytest:
	name: pytest (lightweight)
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-python@v5
	with:
	python-version: '3.11'
	cache: pip
	- name: Install minimal test deps
	# Only stdlib + pytest + fastapi/pydantic for the REST schema test.
	# Tests that need build123d / trimesh / matplotlib run in the
	# separate integration workflow against a real container.
	run: pip install pytest fastapi pydantic
	- name: Run lightweight tests
	# tests/test_versioning.py is pure stdlib + tmp_path filesystem;
	# tests/integration/* runs in integration.yml.
	# test_helpers + test_section + test_smoke need build123d at runtime;
	# they're covered by the integration suite (or future v0.3.2 expansion).
	run: pytest tests/test_versioning.py -v --tb=short

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