👨‍💼 Nice work. Instead of treating login as an obvious next step, you turned it into a narrow implementation plan with explicit UX guardrails.

🦉 This step matters because even a justified feature can still damage the product if it is implemented carelessly. Strong engineers use invariants to choose rollout shape, auth boundaries, and migration paths that protect the experience while the product evolves.

You now have an implementation brief that explains how to add host login while protecting finalized-plan rate, create-flow speed, and attendee completion.