[FEATURE]: Long-running shell commands block the entire conversation

[openchat-ai]

Description

Any command that takes a while (gh run watch, Start-Sleep polling loops, etc.) freezes the whole conversation. You cannot do anything else, cannot cancel, just wait.

I was debugging a flaky CI test. Every time the assistant ran gh run list + Start-Sleep to poll for results, the conversation hung for 60-120s.

Proposed Solution

A simple background flag on the shell tool, similar to timeout.

Command runs in background, conversation stays responsive. Result delivered when done.

Verification

• I have checked that this feature has not been suggested before

[github-actions]

Thanks for updating the issue! It now follows the contributing guidelines and looks good. We appreciate you taking the time to fix it.