Use this skill to implement hybrid search combining BM25 keyword search with semantic vector search using Reciprocal Rank Fusion (RRF).
**Trigger when user asks to:**
- Combine keyword and semantic search
- Implement hybrid search or multi-modal retrieval
- Use BM25/pg_textsearch with pgvector together
- Implement RRF (Reciprocal Rank Fusion) for search
- Build search that handles both exact terms and meaning
**Keywords:** hybrid search, BM25, pg_textsearch, RRF, reciprocal rank fusion, keyword search, full-text search, reranking, cross-encoder
Covers: pg_textsearch BM25 index setup, parallel query patterns, client-side RRF fusion (Python/TypeScript), weighting strate…
