17 tasks: marketing-pages with Pages collection + SiteSettings global +
read use-cases + tRPC router; navigation with Header global + read
use-case + tRPC router. Composes both into core-cms (now 4 collections,
2 globals) and core-api (now 4 namespaces). All Plan 2/3 lessons baked in.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
