Complete P2P system implementation with tests - all core functionality ready

Co-authored-by: moe-charm <217100418+moe-charm@users.noreply.github.com>

src/boxes/p2p_box.rs

@@ -38,7 +38,7 @@
 use crate::box_trait::{NyashBox, StringBox, BoolBox, BoxCore, BoxBase};
 use crate::boxes::IntentBox;
 use crate::transport::{Transport, InProcessTransport, TransportError};
-use crate::messaging::{IntentHandler, MessageBusData};
+use crate::messaging::IntentHandler;
 use std::any::Any;
 use std::sync::{Arc, Mutex};