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Adds a shared reusable workflow that plugin repos can call to enforce the dual CTO+QA approval policy as a GitHub required status check. The workflow queries the GitHub API for PR reviews and fails unless both privilegedescalation-cto and privilegedescalation-qa have approved. Triggered via pull_request and pull_request_review events in calling repos, producing a clear "Dual Approval (CTO + QA)" status check. Co-Authored-By: Paperclip <noreply@paperclip.ing>