automatically query for raw/fused/reconstruction asset inputs

I feel like the primary input arg should really be either just the fused asset uri since that's really the asset these reconstructions are derived from (from which the fused-zarr-path, subject ID, and metadata can be found), or even better just the subject ID, from which both fused image and processed reconstruction assets could be queried ideally. I imagine you'll need to keep the processed reconstruction asset more explicit for now until that part is more settled, but could consolidate the raw and fused references?

_Originally posted by @tmchartrand in https://github.com/AllenNeuralDynamics/nmcp-snapshot-capsule/pull/1#discussion_r2921350476_