bitermplus: v0.10.0

• Removed OpenMP/libomp dependency: replaced parallel loops with NumPy vectorization — installs cleanly on all platforms out of the box
• Performance improvements: perplexity() rewritten using sparse matrix ops, _compute_p_wz() vectorized with NumPy broadcasting, entropy() replaced with masked array operations
• Modernized build system: dropped setup.py in favor of pyproject.toml
• Added ruff: replaced black, isort, and flake8 with ruff for linting and formatting
• New tests: added dedicated unit tests for perplexity, coherence, and entropy