MRICloudRescale
===============

**Purpose.** Rescale ASL and optional M0 NIfTI files by removing header scaling
(``scl_slope``, ``scl_inter``) so downstream math works in raw intensity units.

Behavior
--------

- For each ``{asl}`` (and optional ``M0``), reads from ``rawdata/...``,
  writes rescaled copy into the **derivatives** mirror with identical names.
- Sets output dtype to ``float32`` and clears scaling to 1/0.

Inputs
------

- ``rawdata/<sub>/perf/{asl}.nii`` (and ``{M0}.nii`` if present)

Outputs
-------

- ``derivatives/<sub>/perf/{asl}.nii`` (and ``{M0}.nii``) with rescaled data.

Configuration
-------------

- None.

YAML example
------------

.. code-block:: yaml

    modules:
      - name: MRICloudRescale