changelog-writer

name	changelog-writer
description	Write a CHANGELOG entry from the commits since the last tag. Use when the user asks to prepare release notes or update the changelog.

Changelog writer

1. Run git log $(git describe --tags --abbrev=0)..HEAD --oneline to list commits.
2. Group them into Added / Changed / Fixed sections.
3. Write the result into CHANGELOG.md under a new version heading.
4. Show the diff to the user before committing anything.