Release Notes Writer

Write release notes for version {{version}} of {{projectName}}.

**Audience**: {{audience}} (developers using this library/tool)
**Key changes**:
{{changes}}

**Breaking changes**:
{{breakingChanges}}

Format:
1. **Headline**: one sentence summarizing the most important change
2. **Highlights** (3-5 bullets): the changes users will care about most
3. **Breaking changes**: with migration guide for each
4. **Full changelog**: organized by category (features, fixes, improvements)
5. **Upgrade instructions**: step-by-step
6. **Thank you**: acknowledge contributors (list: {{contributors}})

Tone: professional, concise, appreciative. No marketing language.