openai/gpt-chat-latest → B (10:1)

Side B fixes a substantive algorithmic bug in Rank Centrality by changing the normalization from summed edge weights to degree-based d_max, preventing oscillating bipartite Markov chains and restoring correct rankings for star topologies. It also adds focused Rust and end-to-end regression tests with fixtures covering star, inverse star, chain, and cycle cases. Side A mainly updates the CI Node version, removes an npm upgrade step, and deletes obsolete tests, providing comparatively limited lasting value.