/// Query engine for RouchDB — Mango selectors and map/reduce views.
///
/// Provides two query mechanisms:
///
/// 1. **Mango queries** — CouchDB-compatible selector-based document matching
/// with field projection, sorting, and pagination.
///
/// 2. **Map/reduce views** — Temporary (ad-hoc) views using Rust closures
/// with built-in reduce functions (sum, count, stats) and custom reducers.
pub use ;
pub use ;