Constant ABORT_SENTINEL 

pub const ABORT_SENTINEL: u32 = u32::MAX; // 4_294_967_295u32

exit_reason reported when a recompiler run aborts the VM — a guest CPU fault delivered as an unhandled IDT vector (e.g. #DE from idiv on INT_MIN/-1) surfaces as a host Err(GuestAborted), not an InvocationResult. Distinct from every real PVM2 exit reason (0..=7).