Usability feature: Add `shell` (or similar) as a dedicated slash(/) command

[yeikel]

Describe the feature or problem you'd like to solve

The CLI includes a special keyword ! for executing shell commands, but this behavior is not discoverable or self documented. Unlike / commands, which are visible through autocomplete, ! must be remembered by the user.

This creates a usability gap, especially for new or occasional users who may not know that shell execution exists or may forget how to access it.

Proposed solution

Introduce a discoverable alternative such as a /shell command that behaves the same as !.

This command should appear in the / autocomplete list and clearly indicate that it allows shell execution. It could also include a short description or hint to explain its purpose.

Example prompts or workflows

User types /sh and sees /shell in autocomplete
User selects /shell and enters shell execution mode, equivalent to using !
The CLI optionally shows a short hint such as “Run shell commands, same as !”

Additional context

/ commands are easy to find and use because they are discoverable through autocomplete. In contrast, the ! keyword requires memorization, which makes it less accessible.

Adding a /shell command would improve discoverability, reduce the need to memorize special syntax, and create a more consistent user experience.

[sharpSteff]

i did not know you can execute shell commands via !. Thanks for sharing! a /shell command would be more intuitive (like in gemini cli)