chore(manifest): drop the unread domain_label field (content#144 §5.3… #12

	# Engine conformance gate — structural AND semantic validation.
	#
	# Runs learn-content-engine's validateLesson()/validateManifest() (at the
	# version pinned in schema/engine-version.txt) over the WHOLE repo
	# content: every lesson plus the root and per-set manifests. This is the
	# semantic layer the structural CI (validate_content.py against the
	# vendored JSON Schema) cannot see: cloze blanks == '___' markers,
	# referential integrity of card_ids, multiselect disjointness, picture
	# "exactly one correct". Rationale: a real engine conformance run found
	# two semantic bugs in the official content repo
	# (astrapi69/adaptive-learner-content#92) that the structural CI let
	# through.
	# Gate: zero errors.
	name: Engine conformance

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

	env:
	FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: "true"

	jobs:
	engine-validate:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v5
	- uses: actions/setup-node@v5
	with:
	node-version: "24"
	- name: Install the pinned engine release
	# yaml is installed explicitly (the runner parses the manifests
	# itself); the version range matches the engine's own dependency.
	run: npm install --no-save "learn-content-engine@$(cat schema/engine-version.txt)" "yaml@^2.9.0"
	- name: Self-test (the gate must bite before it may pass)
	run: node scripts/validate_with_engine.mjs --self-test
	- name: Validate all lessons and manifests with the engine
	run: node scripts/validate_with_engine.mjs .

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