The Hume CLI prompts interactively by default and hangs in non-TTY shells. Use flags for non-interactive mode in scripts and CI.

Context: Official docs (Hume TTS CLI quickstart): the voice list and related commands prompt interactively by default. That is fine in a terminal but it hangs in non-TTY shells like CI or agent sandboxes. Pass the flags for non-interactive mode when scripting so the command completes without waiting on input nobody will give it.