DX-2659: Trim llm files #4

	name: llms.txt check

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

	permissions:
	contents: write

	jobs:
	check:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	with:
	# Push back to the PR branch needs the branch ref, not the merge commit.
	ref: ${{ github.head_ref \|\| github.ref }}
	# Use a token that can push back to PR branches.
	token: ${{ secrets.GITHUB_TOKEN }}

	- uses: actions/setup-node@v4
	with:
	node-version: "20"
	cache: "npm"
	cache-dependency-path: llms/package-lock.json

	- name: Install
	working-directory: llms
	run: npm ci

	- name: Check llms.txt is up to date
	id: check
	working-directory: llms
	run: npm run check
	continue-on-error: true

	- name: Auto-commit regenerated llms.txt
	if: steps.check.outcome == 'failure' && github.event_name == 'pull_request'
	run: \|
	git config user.name "github-actions[bot]"
	git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
	git add llms.txt llms-full.txt
	git commit -m "chore(llms): regenerate llms.txt and llms-full.txt"
	git push

	- name: Fail if llms.txt was stale
	if: steps.check.outcome == 'failure'
	run: \|
	echo "::error::llms.txt / llms-full.txt were out of date. A regeneration commit was pushed to this PR — please review it and re-run CI."
	exit 1

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