Rephrase "prompt mode" in the usage instruction

[doggy8088]

Describe the feature or problem you'd like to solve

I wish you could rephrase the term 'prompt mode' using more intuitive words.

Proposed solution

When I run copilot -h, the output shows:

--agent <agent>                     Specify a custom agent to use, only in prompt mode

The term prompt mode is unclear. I think it might mean non-interactive mode, but I'm not sure. It's too vague.

I hope there is a more consistent term for these modes.

I would suggest use the term non-interactive mode. So that we know this --agent <agent> usage only work with --prompt <text>.

Example prompts or workflows

No response

Additional context

No response