v0.1.2

What's new

• cppcheck marker — all cppcheck items are now marked with cppcheck, enabling -m cppcheck, -m "unit or cppcheck", etc.
• README badges — CI status, PyPI version, Python versions, license
• Python version classifiers — PyPI now shows supported Python versions (3.8–3.13)
• Pinned GitHub Actions — all workflow actions pinned to commit SHAs for supply chain safety
• Improved PyPI metadata — README, license, author, and repository links now display on PyPI