write-spec.txt
Feature: <describe it, however roughly>

Write a short spec:
- The problem, in the user's terms, not mine.
- What "done" looks like — specific, checkable conditions.
- The flow, step by step, including what happens when each step fails.
- Data: what's stored, what's changed, what's sent anywhere.
- Explicitly out of scope, at least five things.
- Open questions you need me to answer.

Under 600 words. Ask me the open questions before writing if any of
them change the shape of the spec.

The out-of-scope list is what the spec is for. Without it, scope arrives one reasonable-sounding addition at a time.