Close this session by consolidating what the developer should now KNOW:
- List the 2–3 concepts this session's code actually used (the pattern, the API, the algorithm) — named so they can be looked up later.
- Set ONE small re-implementation exercise: a piece of today's work to redo from a blank file without assistance, sized under 30 minutes.
- Pose one recall question the developer should be able to answer cold tomorrow, with the answer below a spoiler line.
- Be honest about the gap: if most of the session was accepted rather than understood, say which part deserves a re-read first.
The code was today's output; the understanding is the durable one.