huawen-poppy/Unify: Unify manuscript code v1.0.0

This release contains the version of the Unify code used for the analyses reported in the manuscript "Unify Learns Cellular Evolution with Universal Multimodal Embeddings." It includes scripts for cross-species single-cell integration and perturbation prediction tasks. This release is intended to provide a permanent, citable version of the code associated with the manuscript. Large datasets and intermediate files are not included in the repository; data availability is described in the manuscript.