Library generation failed (d706482)

See [failed job](https://github.com/googleapis/google-cloudevents-java/actions/runs/18455864753)

Open the linked failed GitHub Actions job and inspect the failed library-generation step and its logs. Trace the reported failure to the relevant generation entry point, then verify that the job completes successfully and the library is generated.

索引モデルが issue の本文から書いたものです。