Abhinav cfd5d77d63
Detach Unix hook commands from the controlling terminal ( #43876 ) ...
## Why
Shell startup code that accesses the controlling terminal can stop a hook on background terminal I/O, preventing the hook command from running.
## What changed
Use `detach_from_tty` before executing Unix hook commands to avoid inheriting the controlling terminal while preserving process-group cleanup.
## Testing
Add a Unix regression test that runs under a controlling terminal and uses `BASH_ENV` to invoke `stty` during shell startup. Verify that the hook completes successfully and produces the expected output.
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Abhinav
cfd5d77d63