b5849d6ad1
Create EventBus in serveGrpc() and pass to both setupRiver() and NewMusicAgregatorServer() so PollDownloadWorker and the gRPC server share the same event bus instance. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/claude-agent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>