Close a long email argument

Write an email that closes this thread.

Structure:
1. Settled — what everyone has already agreed to. State it as decided, not as proposed. *Most long threads contain more agreement than the participants realize.*
2. Open — the one or two questions actually still in dispute. Everything else goes above.
3. Proposal — how to resolve them: a decision by a named person, a 15-minute call, or a default if no one objects by a date.
4. One line closing the loop.

Rules:
- *Do not re-argue any settled point*, including ones I lost. Reopening them restarts the thread.
- State opposing positions fairly. An unfair summary guarantees a reply.
- Do not add new arguments for my position. This email ends the discussion; it does not win it.
- Under 200 words.

**Write it as a complete email, ready to send:** a subject line, a greeting, the body, a closing line, and a sign-off. ***Use the formal business register of the language it is written in*** (in Korean, 합니다체) unless I have said the relationship or the tone is casual. *Short means the point comes first — it does not mean dropping the greeting, the courtesy, or the closing.* *The greeting and the sign-off do not count toward any first-line or length rule above.*