On our fixed MiniLM CargoNest index, k=10 hit R@k 1.0 at noise 0.85 — k=20 bought zero more Recall

Author 100 FAQ chunks × 15 gold queries on one locked MiniLM index (seed 20260928, API $0). Only top_k / n_results moves ∈ {1,3,5,10,20}. Not a model bakeoff, overlap, filter, or reranker redo. k P