Refactor for Robustness: Fix Error Swallowing and Temp File Generation (#1394)

[amyssnippet]

Fixes #1394

import {$} from 'zx'

// These improvements enhance reliability without changing the API
// - Temp file generation is now robust and won't crash
// - Better error visibility for system issues  
// - Clearer debugging when killing processes

This PR addresses robustness issues identified in #1394 by improving error handling and preventing potential crashes in the zx CLI.