Add GitHub Releases automation with auto-generated changelogs

[jose-compu]

Description

The release workflow creates GitHub releases from CHANGELOG.md, but the changelog is manually maintained. GitHub auto-generated release notes can supplement this.

Proposed Changes

• Add .github/release.yml to configure auto-generated release notes with categories (Features, Bug Fixes, Documentation, CI/CD, Breaking Changes)
• Map labels to categories for clean release notes
• Keep CHANGELOG.md for detailed human-written entries
• Add release-drafter or similar tool as an alternative

Impact

Professional, categorized release notes with less manual effort.