feat(C9): add A2A task handoff identity validation control (9.5.5) #908

	name: Markdown Linter

	on:
	# Scan changed files in PRs (diff-aware scanning):
	pull_request: {}
	# Scan mainline branches and report all findings:
	push:
	branches: ["main"]

	jobs:
	markdown-lint-check:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Set up Node.js
	uses: actions/setup-node@v4
	with:
	node-version: '20'

	- name: Install markdownlint-cli
	run: npm install -g markdownlint-cli

	- name: Get changed markdown files
	id: files
	uses: tj-actions/changed-files@v46
	with:
	files: \|
	README.md
	1.0/en/*/.md

	- name: Run markdownlint on changed files
	if: steps.files.outputs.any_changed == 'true'
	run: \|
	files_string="${{ steps.files.outputs.all_changed_files }}"
	files_string="${files_string//\\n/$'\n'}"
	files=()
	while IFS= read -r file; do
	[ -n "$file" ] && files+=("$file")
	done <<< "$files_string"

	if [ ${#files[@]} -eq 0 ]; then
	echo "No files to check."
	exit 0
	fi

	markdownlint --config .github/workflows/config/markdownlint.jsonc "${files[@]}"

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