v3.0a1

[3.0a1] - 2026-03-03

Added

• Added libcasm.group package for crystallography-independent group utilities, including GenericGroup, Subset, and subgroup finding tools.
• Added Frobenius-Schur indicator to IrrepInfo for classifying real, complex, and quaternionic irrep types.
• Added random commuter method for IrrepDecomposition.
• Added irrep decomposition by disjoint variable sets and random rotation retry for irrep decomposition.
• Added class_indices parameter to IrrepDecomposition for character table construction.
• Added options to select the amount of symmetrization applied after irrep decomposition.
• Added alive-progress dependency for progress status bars.
• Added multithreaded construction of group multiplication table, matrix representations, and make_irrep_special_directions.

Changed

• Refactored Group to move element-type-independent parts into GenericGroup; subgroups now use Subset class; IrrepDecomposition now accepts subgroup orbits as a constructor argument.
• Changed IrrepDecomposition to find input column spaces that do not mix and decompose irreps within each subspace independently, so the decomposition respects the user's initial choice of axes.
• Changed output axes sign convention to prefer vectors where the first element is positive.
• Changed IrrepInfo index and directions attributes to be optional.
• Updated stylize.sh to use .clang-format file instead of Google style.

Fixed

• Fixed constructing full_trans_mat from complex irreps.
• Fixed normalization of real and imaginary parts of complex irrep trans_mat when building the full transformation matrix.

Removed

• Removed deprecated supercells and motif arguments from ConfigEnumAllOccupations.by_supercell and made max a required argument.
• Removed deprecated to_json and from_json methods from libcasm.configuration.Prim.