Review Acme change readiness

1. Read the supplied change proposal. Do not implement it.
2. Identify the affected user, the intended outcome, the main failure risk, and
   a rollback signal.
3. Require an ACME-NNN work-item reference. If it is missing, report that the
   Acme intake convention is not satisfied rather than inventing an identifier.
4. Return a compact readiness brief with User, Outcome, Risk, Rollback,
   and Missing context headings.
5. Label the proposal ready for human review only when every heading has
   concrete content and the Acme work-item reference is present. The human
   maintainer owns the final approval and any exception.