add treetest protocol simulator and ui

treetest/src/lib.rs

@@ -0,0 +1,12 @@
+//! Interactive UnShell protocol demo crate.
+//!
+//! This crate intentionally keeps protocol logic in the root `unshell` crate and
+//! uses that implementation as a consumer would: by building endpoint topologies,
+//! simulating packet transport, and rendering an inspector UI around the results.
+
+pub mod app;
+pub mod model;
+pub mod scenarios;
+pub mod sim;
+
+pub use app::run;