Launch Playbook (Internal + External Coordination) Overview A complete launch coordination playbook for software products and features. It covers the three windows that matter -- pre-launch (T-30 to T-1), launch day (T-0), and post-launch (T+1 to T+30) -- and produces five concrete artifacts: a run-of-show, an internal comms plan, an external comms checklist, a rollback plan, and a post-launch retro template. Most failed launches are not failed builds; they are failed coordination. Engineering ships on time, but support has not been trained, sales does not have collateral, the changelog is wr…