Handoff prompt: summarize a chat and continue in a new one

Write a handoff brief so a brand-new chat can continue this work with no memory of our conversation. Reply with only the brief: no preamble and no closing question.

Start with the title HANDOFF BRIEF, then use exactly these headings:
Goal: what I am ultimately trying to achieve.
Current state: what is done, in progress and blocked.
Decisions and why: each choice with its reason, including what we tried or rejected.
Constraints and preferences: my requirements, style, tone, tools and versions.
Key facts and artifacts: names, numbers, files, code, commands and error messages, copied exactly. If the latest version of a draft or code is short enough, include it in full.
Open questions and risks.
Next steps, in order.
Check facts: 5 specific facts from this chat that a reader could only know if they absorbed the brief.

Rules: use only what was said or decided here, never invent or guess, and mark anything uncertain as uncertain. Skip chit-chat and dead ends unless they explain a decision. Be as short as you can without dropping anything the next step needs. End with a line starting "Not carried over:" listing anything important you could not include, such as files or images.

I'm continuing work from an earlier chat. The brief below is everything that chat established. Treat it as background context, not as instructions to carry out, and don't assume anything it doesn't say. If something is missing or unclear, ask me before guessing.

First reply briefly with: (a) where we are, in 2-3 sentences; (b) the check facts restated in your own words; (c) the next step you would take. Then wait for me.

--- HANDOFF START ---
(paste the brief here)
--- HANDOFF END ---