Library generation failed (d706482)

See [failed job](https://github.com/googleapis/google-cloudevents-java/actions/runs/19400808612)

Start by inspecting the failed job linked in the issue: https://github.com/googleapis/google-cloudevents-java/actions/runs/19400808612. Identify which library-generation step failed and review its reported logs and workflow context. Done means the generation job completes successfully and produces the expected library output.

Written by the indexing model from the issue text.