fix: ruvector ip metric normalization #98
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This PR fixes a similarity calculation bug in
RuVectorBackend.ts.1. IP Metric Normalization
ip(Inner Product) metric was returning raw negative distances as "similarity". This resulted in unbounded values, violating theVectorBackendinterface contract (which requires0-1normalized similarity) and causing thresholding logic to fail.distanceToSimilarity()to use a Sigmoid function (1 / (1 + exp(-distance))) for theipmetric.Result: All vector backends (RuVector and HNSWLib) now return consistent, normalized similarity scores across all distance metrics.