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docs: add Campaigns OS Start path #46

	name: CI

	# The same sequence a clean checkout runs locally:
	# npm ci -> npm run build (generates references, stats, capability map, previews,
	# then next build) -> npm run check (post-build agent-surface assertions,
	# frontmatter, link validation against the generated tree).
	# `validate-links` alone regenerates first; here the build already did.

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

	permissions:
	contents: read

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	build-and-validate:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@d23441a48e516b6c34aea4fa41551a30e30af803 # v6.1.0

	- uses: actions/setup-node@249970729cb0ef3589644e2896645e5dc5ba9c38 # v6.5.0
	with:
	node-version: '22'
	cache: npm

	- run: npm ci

	- run: npm run build

	- run: npm run check