Function configure_background_process_group 

pub fn configure_background_process_group(command: &mut Command)

Places a child in a new process group and makes terminal diagnostics safe.

Supervised CLI children run in the background relative to the caller’s terminal process group. Ignoring SIGTTOU before exec lets tools that inspect or write inherited diagnostic streams finish instead of being stopped by terminal job control. stdin remains the caller’s responsibility; non-interactive callers should set it to Stdio::null().