Orchestrating GitHub Actions workflows

Description

Design and review GitHub Actions workflow orchestration - reusable workflows (workflow_call with typed inputs, explicit secrets and outputs), calling them from other workflows and repos, job dependencies and outputs, matrices, concurrency groups, manual and scheduled runs (workflow_dispatch, schedule, repository_dispatch), chaining workflows (workflow_run) safely, environments with required reviewers and deployment branch rules, OIDC deployments, and secrets and variables across all of it with a security analysis. Use whenever the user builds a deploy pipeline, shares CI across repositories, asks about reusable workflows, environments, approvals, passing secrets between workflows, inheriting secrets, promoting builds between environments, or reviews multi-workflow automation - even if they only say "set up staging and production deploys".