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## Summary Fix the Windows sandbox PTY spawn path to pass the pseudoconsole handle value directly into `UpdateProcThreadAttribute`. ## Why Sandboxed `unified_exec` PTY sessions on Windows were failing during child process startup with `0xc0000142` (`STATUS_DLL_INIT_FAILED`). In practice this showed up as PowerShell DLL init popups when the sandboxed background-terminal path tried to launch an interactive shell. The root cause was that we were passing a pointer to a local `isize` variable instead of the pseudoconsole handle value in the form Windows expects for `PROC_THREAD_ATTRIBUTE_PSEUDOCONSOLE`. ## Validation - `cargo build -p codex-windows-sandbox --bins` - Reproduced the real sandboxed `codex exec` flow with `windows.sandbox_private_desktop=true` - Verified a `tty=true` interactive session launched through the normal PowerShell wrapper, printed `READY`, accepted follow-up stdin, and exited cleanly - Confirmed no new `0xc0000142` / `Application Popup` events appeared after the successful repro