//! `aura-core` — the shared contract every aura component links against.
//!
//! This crate is the boundary forced by the cdylib hot-reload model: both the
//! engine and every hot-reloadable node cdylib depend on it, so it stays small
//! and stable.
//!
//! Delivered so far (cycle 0001 — the streaming substrate):
//!
//! - the four scalar base types streamed as SoA: [`Scalar`] / [`ScalarKind`] /
//!   [`Timestamp`] (C7);
//! - [`Column`] — a fixed-capacity, bounded-lookback ring with financial
//!   indexing (index 0 = newest) and a `run_count` freshness primitive (C5/C8),
//!   read zero-copy through a [`Window`];
//! - [`AnyColumn`] — the type-erased edge over the four column kinds, with an
//!   edge-time kind check ([`KindMismatch`]) (C7).
//!
//! Delivered in cycle 0002 — the node contract:
//!
//! - [`Node`] — the `schema`/`eval` contract every node implements (C8), with
//!   [`NodeSchema`] / [`InputSpec`] declaring inputs (kind + lookback) and the
//!   single output kind;
//! - [`Ctx`] — the per-`eval` read-side: zero-copy, financial-indexed [`Window`]
//!   access into each input (closing the cycle-0001 read-side gap on
//!   [`AnyColumn`]).
//!
//! Still to come (subsequent cycles): the firing policies (A: fire-on-any-fresh +
//! hold; B: all-fresh barrier), the deterministic sim loop, sources, and
//! ingestion.

mod any;
mod column;
mod ctx;
mod error;
mod node;
mod scalar;

pub use any::AnyColumn;
pub use column::{Column, Window};
pub use ctx::Ctx;
pub use error::KindMismatch;
pub use node::{InputSpec, Node, NodeSchema};
pub use scalar::{Scalar, ScalarKind, Timestamp};