Changes in version 1.0.0 (2026-07-04)                  

  - First release.
  - Six construction methods for nested partially balanced bipartite
    block (NPBBB) designs: construct_method1 to construct_method6.
  - Exact A-efficiency evaluation for the block and sub-block
    classifications via info_matrix, a_value, a_value_optimal and
    npbbb_efficiency, benchmarked against the A-optimal completely
    symmetric reference design.
  - print methods for the "npbbb" and "npbbb_efficiency" classes,
    including a full physical block / sub-block layout.
  - n_units helper for the total number of experimental units.