Function arbos_from_input 

pub fn arbos_from_input<S: StorageBackend, B: Burner>(
    backend: &mut S,
    burner: B,
) -> Result<ArbosState<'static, Detached, B>, ArbosStateError>

Open a detached ArbosState backed by any StorageBackend.

Reads only the version slot up front; all subsequent access goes through backend. Intended for callers that have a storage view but no executor state pointer — precompile handlers via EvmInternals, RPC tools reading historical state through a StateProvider, etc. The version slot is read up front so a mismatch between the pinned build and the stored ArbOS version surfaces as ArbosStateError::UnsupportedVersion instead of silently reading the wrong slot.