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rankTfIdf and rankBm25 (configurable k1/b) over the candidate set, float scores with deterministic DocId tiebreak; topNTfIdf/topNBm25. df/idf derived from posting-list length. Tests cover tf/idf behavior, a BM25-vs-TF-IDF flip from length-norm + tf-saturation, the b-parameter effect, tiebreak stability. 101/101. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>