Week 1 — Explore & run

The goal this week is to see the system with your own eyes. No PRs yet; just clicks, prints, and reads. By the end of the week you should be able to point at any box on the ArchitectureExplorer and say what runs there and where its code lives.

By the end of Week 1, you can:

Check-in

Before moving to Week 2, make sure you can answer these without looking:

1. Which port runs the Next.js app and which port runs the Go Hub?
2. Where does a new Response row get written, and what happens next?
3. Which env var signs the session JWT?

If any of those is fuzzy, revisit the milestone above it.