//! Retrieval modules for hybrid search.
//!
//! This crate supports hybrid retrieval combining:
//! - **BM25**: Keyword/exact matching for short queries
//! - **HDC**: Semantic similarity for natural language queries
//!
//! The hybrid approach uses query-length-dependent weighting:
//! - Short queries (1-2 tokens): 90% keyword, 10% semantic
//! - Long queries (9+ tokens): 20% keyword, 80% semantic
pub use ;
pub use ;