docs(plan): add Plan 4 (marketing-pages + navigation features)

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>
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2026-05-05 08:24:33 +02:00
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