context_builder: 라운드로빈 다양화 제거 → cross-source cross-encoder reranker. source 무관 적합도 순 top-N. pipeline 에서 query 전달

src/kpaa/pipeline.py

@@ -78,7 +78,7 @@ async def build_context(
         )
     raw = await retrieve(plan, client=client, on_progress=on_progress)
     ranked = ranker.rank(raw)
-    block = context_builder.build(ranked)
+    block = context_builder.build(ranked, query=plan.query)
     return RetrievalResult(
         plan=plan,
         excerpts=ranked,