Driver Loading

One reified thesis-to-driver edge: how strongly, and how confidently, a given Driver drives a WorldviewThesis. Embedded as a list entry of hasDriverLoading. Carries loadingDriver (the force), loadingStrength (a distributional estimate - mean = how much this driver explains the thesis, stdDev = confidence in the mapping), and a loadingRationale. Multiple theses loading on the same Driver, weighted by their loadingStrength, is the quantitative basis for counting a shared force once when deduplicating overlapping exposure downstream - the same tagged-by-type distributional pattern as alignmentStrength on an AlignedSecurity.