feat: add README validator configuration and update requirements #54

	# Standalone markdown lint for org-wide enforcement via Required Workflows.
	#
	# Referenced by dryvist/terraform-github's github_organization_ruleset, which
	# injects this workflow into the default-branch PRs of EVERY repo in the org.
	#
	# Unlike the reusable _markdown-lint.yml (which defers to each repo's own
	# markdownlint config and only falls back to the org default), this FORCES the
	# single canonical config from dryvist/.github. That is the point: identical
	# rules org-wide, zero per-repo .markdownlint* files to drift. Once this is
	# active, the reusable workflow + per-repo configs + per-repo `uses:` wiring
	# can be retired.
	name: Markdown Lint

	on:
	pull_request:

	permissions:
	contents: read

	concurrency:
	group: org-markdown-lint-${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	markdownlint:
	name: Lint
	runs-on: ubuntu-latest
	steps:
	- name: Checkout target repo
	uses: actions/checkout@v6

	- name: Checkout org config (single source of truth)
	uses: actions/checkout@v6
	with:
	repository: dryvist/.github
	ref: main
	path: .org-github

	- name: Run markdownlint with the forced org config
	uses: DavidAnson/markdownlint-cli2-action@v23
	with:
	config: .org-github/.markdownlint-cli2.yaml
	globs: \|
	*/.md
	!.org-github/**

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