plugin: fix instance lifecycle blockers

resources/plugin/templates/rust-component-instance/src/lib.rs

@@ -1,6 +1,14 @@
 use serde_json::{json, Value};
+use yoi_plugin_pdk::wit_bindgen;
 use yoi_plugin_pdk::{export_plugin_instance, Plugin, PluginIngressEvent, PluginStatus, ToolOutput};
 
+wit_bindgen::generate!({
+    world: "instance",
+    path: "../../../../resources/plugin/wit",
+    generate_all,
+    runtime_path: "yoi_plugin_pdk::wit_bindgen::rt",
+});
+
 struct ExamplePlugin {
     calls: u64,
 }
@@ -12,14 +20,21 @@ impl Plugin for ExamplePlugin {
 
     fn handle_tool(&mut self, name: &str, input: Value) -> yoi_plugin_pdk::Result<ToolOutput> {
         self.calls += 1;
-        Ok(ToolOutput::text(json!({
-            "tool": name,
-            "calls": self.calls,
-            "input": input
-        }).to_string()))
+        ToolOutput::json(
+            format!("{name} handled by shared instance"),
+            json!({
+                "tool": name,
+                "calls": self.calls,
+                "input": input
+            }),
+        )
     }
 
-    fn handle_ingress(&mut self, name: &str, event: PluginIngressEvent) -> yoi_plugin_pdk::Result<Value> {
+    fn handle_ingress(
+        &mut self,
+        name: &str,
+        event: PluginIngressEvent,
+    ) -> yoi_plugin_pdk::Result<Value> {
         Ok(json!({
             "ingress": name,
             "kind": event.kind,
@@ -34,4 +49,4 @@ impl Plugin for ExamplePlugin {
     }
 }
 
-export_plugin_instance!(ExamplePlugin);
+export_plugin_instance!(ExamplePluginComponent, ExamplePlugin);