~anthropic/claude-sonnet-latest → B (9:1)

Side B fixes a real algorithmic bug (bipartite Markov chain causing incorrect ranking convergence) with a mathematically justified change grounded in cited literature, plus regression tests in both Rust and Clojure across multiple topologies. Side A merely deletes two existing tests and tweaks CI node version/npm install, providing no new functionality or bugfix and reducing test coverage.