ufv_share_tucker_variations
===========================

.. py:function:: t3toolbox.backend.sharing.ufv_share_tucker_variations(variations_data, shared_data, rcond = None)

   .. code-block:: python

      def ufv_share_tucker_variations(
              variations_data,   # UT3Variations .data: (tkv_sc, ttv_sc, shape, (4 masks)); stack = K + C
              shared_data:    'SharedFrameData',  # the frame's UNIFORM companion (ufv_shared_frame_data)
              rcond:          float = None,         # relative clip on the group spectrum; None -> dtype eps * max dim
      ):  # -> tied variations .data (same masks; padded rows come back exactly zero)


   The uniform twin of :py:func:`fv_share_tucker_variations` (the manifold tied post-pass):
   mask the variation supercores, delegate to the polymorphic ragged solve on the mode slices,
   re-stack. The companion's masked ``U_M`` zeroes every padded row of the redistribution, so the
   output is masked-clean and the masks are unchanged.