Library generation failed (f898e26)

See [failed job](https://github.com/googleapis/google-cloudevents-java/actions/runs/17184624400)

Start with the linked failed job for run 17184624400 and identify which library-generation step failed. The issue names no files or tests, so use the job logs to locate the failing entry point. Done means the generation job completes successfully for f898e26.

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