Add a Python-based test script that runs musrfit -c on each example
msr-file, extracts the maxLH or chisq value, and checks it against
a reference value with a relative tolerance of 1e-4. Covers all 13
example msr-files (single histogram and asymmetry fits).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>