feat: Implement new synchronization state management and deterministic head sorting, replacing the old vector clock module.

lattice-core/src/lib.rs

@@ -4,7 +4,7 @@
 //! - **Node**: Identity with Ed25519 keypair
 //! - **SigChain**: Append-only cryptographically signed log
 //! - **Entry**: Atomic operations in the log
-//! - **VectorClock**: Causality tracking for reconciliation
+//! - **SyncState**: Per-author sequence tracking for reconciliation
 //! - **HLC**: Hybrid Logical Clock for ordering
 //! - **Clock**: Time abstraction for testability
 //! - **Proto**: Generated protobuf types from lattice.proto
@@ -16,7 +16,7 @@
 pub mod node;
 pub mod sigchain;
 pub mod entry;
-pub mod vector_clock;
+pub mod sync_state;
 pub mod hlc;
 pub mod clock;
 pub mod proto;
@@ -33,12 +33,12 @@ pub const MAX_ENTRY_SIZE: usize = 16 * 1024 * 1024;
 pub use node::Node;
 pub use sigchain::SigChain;
 pub use entry::Entry;
-pub use vector_clock::VectorClock;
+pub use sync_state::{SyncState, AuthorInfo, MissingRange};
 pub use hlc::HLC;
 pub use clock::{Clock, SystemClock, MockClock};
 pub use data_dir::DataDir;
 pub use signed_entry::{EntryBuilder, sign_entry, verify_signed_entry, hash_signed_entry};
-pub use log::{append_entry, read_entries, LogReader};
+pub use log::{append_entry, read_entries, read_entries_after, LogReader};
 pub use store::Store;
 pub use meta_store::MetaStore;
 pub use proto::HeadInfo;