Cohort 4: Week 5 — Action + Surface (end-to-end v1)

​Wire the workflow end-to-end this week: input → reasoning → output → wherever the user sees it. The bar is the laziest possible surface that gets the output to the user — Notion page over custom UI, Slack DM over Slack app — and a 2–3 minute Loom showing it run on a real input.