# Track closed at decision playbook (issue #10)

Learner finished lesson 7 (decision playbook) with all quiz answers correct. Can run four gates — job (mono vs poly), tool layer (graph/tasks/affected vs collocation), tool family (moon vs Turborepo vs Nx vs Bazel), ship risks (map, inherit, pin, affected, ownership, inputs) — and defend monorepo+moon for multi-project standardization without feature tourism. Mission success criteria from issue #10 are met at lesson-first depth (external comparison primaries optional). Keep `reference/decision-playbook.html` + deal-breakers + architecture/loop/inheritance/toolchain sheets for real reviews. No further core lessons planned unless a new gap appears (e.g. hands-on trio-moon lab, deeper `moon ci`, forced Nx/Bazel project).