//! Retrieval Module
//!
//! End-to-end query processing and result retrieval.
//!
//! # Architecture
//!
//! ```text
//! ┌─────────────────────────────────────────────────────────────┐
//! │ QueryEngine │
//! ├─────────────────────────────────────────────────────────────┤
//! │ 1. Validate query │
//! │ 2. Pre-filter candidates (optional) │
//! │ 3. Vector search │
//! │ 4. Fetch records from store │
//! │ 5. Rerank results │
//! │ 6. Build priors │
//! └─────────────────────────────────────────────────────────────┘
//! ```
//!
//! # Query Types
//!
//! - Single-index query
//! - Multi-index query with fusion
//! - Filtered query with metadata constraints
pub use ;
pub use ;