//! Checkpoint barrier protocol and storage.
//!
//! Coordinator-triggered barriers flow through sources to trigger consistent
//! state snapshots. The fast path is a single `AtomicU64` load (~10ns).
/// Checkpoint barrier types and cross-thread injection.
/// Unified checkpoint manifest types
/// Checkpoint persistence trait and filesystem/object store implementations
/// Object store factory — builds S3, GCS, Azure, or local backends from URL schemes.
pub use ;
pub use ;
pub use ;