SaveOutputs (Preclinical)
=========================

**Purpose.** Persist key arrays from the pipeline context to ``.npy`` files; optionally echo the YAML config.

Context I/O
-----------

- **Reads:** any of ``ImageDif``, ``Mat0``, ``relCBF``, ``absCBF``, ``BrainMask``; and ``savedir``.
- **Writes:** corresponding ``.npy`` files under ``savedir``; optional ``config_echo.yaml``.

Parameters
----------

=================  ===================  ==========================================
Key                Type / Default       Meaning
=================  ===================  ==========================================
``config_echo``     str / *None*        If provided, content is written to ``config_echo.yaml``
=================  ===================  ==========================================

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

.. code-block:: yaml

    modules:
      - name: SaveOutputs
        params:
          config_echo: |
            # Saved pipeline configuration
            steps:
              - ControlLabelSplit
              - DiffImage
              - ComputeM0
              - CBFRelative
              - BrainMask