badges: sync to core @ 819bdf9 + mechanical badge invariant (W5.4) #21

	name: examples

	on:
	pull_request:
	paths:
	- 'examples/**'
	- 'scripts/examples/**'
	- 'core.pin'
	- '.github/workflows/examples.yml'
	push:
	branches: [main]
	schedule:
	# Weekly core-drift check: re-validate against core@main and surface breakage.
	- cron: '0 6 * * 1'

	jobs:
	validate:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: resolve core ref
	id: core
	run: \|
	if [ "${{ github.event_name }}" = "schedule" ]; then
	echo "ref=main" >> "$GITHUB_OUTPUT" # drift check: latest
	else
	echo "ref=$(grep -v '^#' core.pin \| head -1 \| tr -d '[:space:]')" >> "$GITHUB_OUTPUT"
	fi

	- name: checkout core (public, no token needed)
	uses: actions/checkout@v4
	with:
	repository: paged-media/core
	ref: ${{ steps.core.outputs.ref }}
	path: core

	# core/rust-toolchain.toml pins the channel; rustup honors it inside ./core.
	- uses: dtolnay/rust-toolchain@stable
	- uses: Swatinem/rust-cache@v2
	with:
	workspaces: core
	key: ${{ steps.core.outputs.ref }}

	- name: build paged-inspect
	run: cargo build --release --manifest-path core/Cargo.toml -p paged-renderer --bin paged-inspect

	- uses: pnpm/action-setup@v4
	- uses: actions/setup-node@v4
	with:
	node-version: 20
	cache: pnpm
	- run: pnpm install --frozen-lockfile

	- name: validate every example against the renderer
	run: PAGED_INSPECT="$PWD/core/target/release/paged-inspect" pnpm validate:examples

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