# Lesson 6 complete — core mission payoff

Learner finished lesson 6 (decision playbook) with all quiz answers correct. Can run four gates in a design review: job (SW vs dedicated worker vs CDN/Cache alone), lifecycle (register/scope/install/waiting/activate/skipWaiting/claim), fetch policy (respondWith, navigate vs API), and ship risks (stale shell, update lag, wrong cache-first, dual-cache, DevTools). External primaries remained optional throughout. **Core Service Workers mission (issue #9) complete** at decision-fluency bar. Optional later: hands-on lab, client messaging depth, Workbox as a map over the same gates.