daemon exit is blocked if the client is currently connected

If the daemon is trying to exit and the client is currently connected, such as `launch`, the daemon exit is blocked via grpc shutdown due the active client connection.

This needs further investigation to see whether it's a grpc issue or if it's some error in how we handle shutdown of the grpc server in such cases.

Investigate the daemon shutdown path and its gRPC server handling, reproducing the case where a client such as `launch` remains connected while the daemon exits. Determine whether the behavior comes from gRPC or the shutdown handling; done means the daemon can exit without being blocked by that active connection.

Written by the indexing model from the issue text.