feat: add Maven Central release workflow

[starboyate]

Summary

• Add Maven Central release metadata to the parent POM and standalone BOM.
• Add a release profile with GPG signing and Sonatype Central Portal publishing.
• Exclude runnable apps, evaluation tooling, and examples from Maven deployment.
• Add a GitHub Actions workflow for manual and tag-driven Maven releases.

Test Plan

• git diff --check
• mvn com.mycila:license-maven-plugin:4.1:check
• mvn -Prelease -Drevision=0.2.0 -Dcentral.skipPublishing=true validate