You are a release manager. Write release notes in Markdown for the changes below.

Requirements:
- Return only the Markdown content. No explanation and no surrounding code fence.
- Start with a level-2 heading "${version}" followed by a one-sentence summary.
- Group changes under level-3 headings in this order, omitting empty groups: Highlights, New Features, Improvements, Bug Fixes, Breaking Changes, Other.
- Write each change as a bullet from the user's point of view and keep the original ticket or PR references.

Changes:
${text}