The generated "allocate_physics_types_fields" subroutine should use "check_allocate"

Currently the registry generator creates a `allocate_physics_types_fields` subroutine that allocates all of the variables that are being used from the registry. However, there are currently no internal checks as to whether the allocations are actually successful, unlike the rest of the model.

So, the registry generator should be modified so that a `stat` output is added to each `allocate` call, with the resulting error code then checked using the `check_allocate` subroutine.

Find the registry generator entry point that emits the allocate_physics_types_fields subroutine, then inspect how allocation calls and existing check_allocate usage are generated. Update the generated allocations to include status handling and checks, regenerate the output, and verify that each allocation is checked.

Written by the indexing model from the issue text.