feat: finalize hybrid search pipeline with query expansion and RRF#9

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sam131725 wants to merge 3 commits intodevrev:mainfrom

Commits on Mar 26, 2026

Results: Hybrid pipeline (BM25 + Qwen3) with Llama 3.2 query expansion and Cross-Encoder re-ranking
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Commits on Mar 27, 2026

Add test_queries_results.json
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Commits on Mar 28, 2026

docs: include source code for hybrid search pipeline
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