Vouch request: [natedemoss]

[natedemoss]

What do you want to work on?

I want to work on #2732 bc the sandbox exec returns 0 when the stream ends without an exit event. I want to track this code as Option and error if its missing.

Why this change?

this affects anything that reads the exit code instead of watching the output: scripts, CI, and agent orchestrators like NemoClaw, which already hit this and had to add its own workaround

Checklist

• I wrote this request myself (not AI-generated)
• I have read CONTRIBUTING.md