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Introduces Reranker ABC, ColBERTReranker (lazy-loads colbert-ai with graceful fallback), and TwoStageRetriever that composes KnowledgeStore BM25 recall with optional semantic reranking. Includes 8 tests covering filters, top_k limits, mock reranker invocation, and recall_k sizing. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>