Prompt Changelog & Impact Writer Prompt

Write a changelog entry for the prompt change below.
Include:
- What changed (diff summary, not full text).
- Why (the problem the old prompt had).
- Expected impact (which outputs improve, which regress, which are unaffected).
- The eval result before vs. after (or "pending" if not yet run).
- Rollback note (the old version is tagged {{tag}}).

Old prompt: {{old}}
New prompt: {{new}}

Replace the {{fields}} with your own context and tighten the rules to match your domain.