First release

• Datasets for 1D Bin Packing with Cardinality Constraints (BPCC) at scale.
• All solutions achieve the theoretical optimum.
• Large-scale verified optimal packings.
• SOTA snapshot + independent validation script provided.
• Repository: https://github.com/mllmso/Optimal_Balanced_1D_Bin_Packing
• License: CC-BY-4.0