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## Summary by CodeRabbit
* **Chores**
* Updated release notes extraction workflow to improve handling of
version headers in generated release notes.
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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Automated release-notes generation with layered fallbacks (use
provided notes, extract from changelog, generate from previous release,
call provider APIs, or default message).
* New version-validation step to ensure package versions are consistent
before publishing.
* **Chores**
* Moved release-notes logic into a reusable workflow and rewired the
manual release process to consume its outputs for more consistent
releases.
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