Add BM25 retrieval and RRF fusion#31
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…TS into Docstra facade
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Adds BM25 lexical retrieval and Reciprocal Rank Fusion alongside the existing dense Chroma path. A new SQLite/FTS5 store at .docstra/index.db indexes chunk content and symbol names; FusionRetriever runs both sources and the dense path in parallel and fuses with RRF (k=60), replacing the regex-based HybridRetriever at every call site. Knobs live under user_config.retrieval (rrf_k, fts_chunks_top_k, fts_symbols_top_k). Closes #19.