//! Low-level FITS helpers shared by the combine and extract pipelines.
//!
//! These were extracted into the [`atfits_rs`] crate (shared with `convolve-rs`):
//! update-in-place keyword editing, header geometry / WCS axis lookup, the
//! `f32`/`f64` [`CubeElem`] section I/O, and image-HDU creation/resize. This
//! module re-exports them so the combine/extract code keeps importing from
//! `crate::fits_io`.
pub use ;