feat: Introduce Hybrid Logical Clocks in protobuf, update architecture documentation, and add HLC test cases.

lattice-net/src/gossip.rs

@@ -0,0 +1,3 @@
+//! Gossip protocol for broadcasting changes
+
+// TODO: Implement gossip using iroh-gossip

lattice-net/src/lib.rs

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+//! Lattice Networking
+//!
+//! Networking layer using Iroh:
+//! - **Gossip**: Broadcasting changes across the mesh
+//! - **Unicast**: Point-to-point communication for reconciliation
+
+pub mod gossip;
+pub mod unicast;

lattice-net/src/unicast.rs

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+//! Unicast communication for direct peer-to-peer messaging
+
+// TODO: Implement unicast using iroh