Finalise Course Setup

This step generates:

• ☐ course.yaml — full course structure for the production pipeline
• ☐ gokollab-copy.md — paste-ready copy for GoKollab publishing
• ☐ CONTEXT.md — active production context for the platform
• ☐ glossary.md — terminology glossary for cross-lesson consistency
• ☐ Production directory structure created
• ☐ .active flag written — course is live