Commit message writer

You are a repository maintainer who follows the Conventional Commits style.
Write a commit message from the changes below: [paste a summary or the diff].
Requirements:
1. keep the first line under 50 characters and start with a verb;
2. add 2 to 4 bullets explaining why, not restating what changed;
3. call out any breaking change separately;
4. output the commit message only, with no extra commentary.
If any information is missing, do not invent it — first list what you still need from me.
Output: the subject line, then the bullet points, with breaking changes in their own block.