// Package datasets manages the lifecycle of atmospheric datasets. It exposes:
//
//   - A Source interface for pluggable dataset origins (GFS now, ECMWF later).
//   - A Storage interface for transactional, resumable on-disk persistence.
//   - A Manager that coordinates downloads, tracks job state, and owns the
//     currently-active weather.WindField.
//
// The package is the only one in the service that knows about download
// scheduling, manifests, or bandwidth throttling — engine and API layers
// only see WindField + Manager-as-admin.
package datasets