Optional consumer seam: given a node and the affine m that a pose-transform
action applied to the node's POSE, return updated data with the node's
data-held geometry transformed by m, or null if this node has no
data-held geometry (the kit leaves data alone).
Optional consumer seam: given a node and the affine
mthat a pose-transform action applied to the node's POSE, return updateddatawith the node's data-held geometry transformed bym, ornullif this node has no data-held geometry (the kit leavesdataalone).