Library generation failed (d706482)

See [failed job](https://github.com/googleapis/google-cloudevents-java/actions/runs/18813422056)

Start with the failed job linked in the issue: https://github.com/googleapis/google-cloudevents-java/actions/runs/18813422056. Inspect the failure for generation at commit d706482 and identify the relevant build step; the issue is done when library generation completes successfully.

Written by the indexing model from the issue text.