- Replace description_text_full with description_text in vector search (reduce token bloat)
- Add description_text to CASE 1 (code search) and CASE 3 (vector search)
- Fix generic word fallback: 'quần bán chạy' now filters correctly
- Derive GENERIC_WORDS from PRODUCT_LINE_MAP (auto-sync)
- Fix duplicate if include_product_ids in conversation_manager.py
- Add product_mapping.py with PRODUCT_LINE_MAP and resolve functions