//! I/O utilities for OxiGrid data: CSV, JSON serialization, and digital twin export.
//!
//! - [`csv`] — CSV time-series import/export for measurement and forecast data
//! - [`serialize`] — serde helpers and custom serializers for all core types
//! - [`oxirs_bridge`] — JSON-LD digital twin export (`ToDigitalTwin` trait,
//! `DigitalTwinModel`, `DtAsset`); compatible with oxirs / RDF / JSON-LD consumers