Derive publish artifact version from GitHub release tag

[Copilot]

Publishing must use the GitHub Release version as the Maven artifact version, rather than a static project version. This change wires release-triggered publishing to inherit github.event.release.tag_name at publish time.

• Workflow version source

  • Split publish execution by trigger in .github/workflows/publish.yml.
  • For release events, inject Gradle project version from the release tag via environment override.

• Trigger-specific behavior

  • release path: publishes with ORG_GRADLE_PROJECT_version=${{ github.event.release.tag_name }}.
  • workflow_dispatch path: preserves existing behavior (no forced version override).

- name: Publish release to GitHub Packages
  if: github.event_name == 'release'
  env:
    ORG_GRADLE_PROJECT_version: ${{ github.event.release.tag_name }}
  run: ./gradlew publish