add treetest protocol simulator and ui

treetest/tests/routing.rs

@@ -0,0 +1,51 @@
+use treetest::{model::NodeId, scenarios::built_in_scenarios, sim::Simulation};
+
+#[test]
+fn nested_route_uses_longest_prefix_path() {
+    let scenarios = built_in_scenarios();
+    let mut simulation = Simulation::new(scenarios[2].clone()).expect("scenario should build");
+
+    simulation
+        .call_echo_leaf(NodeId(2), "echo", "nested")
+        .expect("echo call should start");
+    simulation.drain().expect("network should drain");
+
+    let trace_text = simulation
+        .trace
+        .iter()
+        .map(|event| event.summary.clone())
+        .collect::<Vec<_>>()
+        .join("\n");
+    assert!(trace_text.contains("forwarded frame to child /alpha"));
+    assert!(trace_text.contains("forwarded frame to child /alpha/beta"));
+    assert_eq!(
+        simulation.latest_root_data_text().as_deref(),
+        Some("nested")
+    );
+}
+
+#[test]
+fn chunked_endpoint_procedure_returns_multiple_packets() {
+    let scenarios = built_in_scenarios();
+    let mut simulation = Simulation::new(scenarios[1].clone()).expect("scenario should build");
+
+    simulation
+        .call_endpoint_procedure(
+            NodeId(1),
+            "demo.endpoint.v1.stream.chunked_greeting",
+            b"go".to_vec(),
+        )
+        .expect("procedure call should start");
+    simulation.drain().expect("network should drain");
+
+    let root_data_count = simulation
+        .recorded_events
+        .iter()
+        .filter(|event| matches!(event, treetest::sim::RecordedEvent::Data { node_path, .. } if node_path == "/"))
+        .count();
+    assert!(root_data_count >= 3);
+    assert_eq!(
+        simulation.latest_root_data_text().as_deref(),
+        Some("chunk 3: hook complete")
+    );
+}