Please explain the motivation behind the feature request.
When using goose CLI with the Claude Code CLI provider, goose's output is not streamed. User gets the loading animation until goose is complete with the request. This makes it difficult to catch when goose is going in the wrong direction and the user wants to Ctrl+C and try a different prompt.

Describe the solution you'd like
Support streaming output via the Claude Code CLI provider. The anthropic API should support this.

Describe alternatives you've considered
The best alternative is to use claude code directly. But we all know that goose is cooler 🪿

Additional context
n/a

• I have verified this does not duplicate an existing feature request