Release 0.3.0

[github-actions]

🚀 Release 0.3.0

📝 Changes

• 17 PRs included in changelog
• Version bumped to 0.3.0

✅ Review Checklist

• Version number correct in pom.xml
• CHANGELOG.md reviewed
• CI passes

🔄 After Merge

1. Finalize Release → tag v0.3.0 + GitHub release
2. Deploy to Maven Central → publish artifacts

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