Trinity v6.37.0 - BM25 + CrossEncoder Reranker

v6.37.0\n\nBM25 Sparse Retrieval, CrossEncoder Reranker, Channel Config\n\n### New\n- BM25SparseRetriever: keyword-based sparse retrieval (443 lines)\n- CrossEncoderReranker: cross-encoder re-ranking (271 lines)\n- ChannelConfig: 47-channel config management (156 lines)\n\n### Enhancements\n- PostgreSQL Adapter: +686 lines, improved connection pooling\n- Core Cache: +464 lines, better eviction, TTL support\n- Retrieval Module: +445 lines, cascade logic enhancement\n- Mixed Index: +264 lines, hybrid search improvement\n\n### Stats\n+2730 / -230 lines across 11 files, 3 new modules\n\n### Install\npip install trinity-memory==6.37.0