fix(server): Pi extension notifications render as notices, not tool calls

packages/provider-pi/src/server/adapter.test.ts

@@ -1069,10 +1069,7 @@ describe("PiAdapterV2", () => {
         message: "Ordering barrier",
       });
       yield* takeEvent(
-        (event) =>
-          event.type === "turn_item.updated" &&
-          event.turnItem.type === "dynamic_tool" &&
-          event.turnItem.toolName === "notify",
+        (event) => event.type === "turn_item.updated" && event.turnItem.type === "system_notice",
       );
       assert.equal(runtime.providerSession.status, "running");
       fake.queueState({ isStreaming: true });
@@ -2368,9 +2365,17 @@ describe("PiAdapterV2", () => {
         type: "extension_ui_request",
         id: "ui-cmd",
         method: "notify",
-        message: "done",
+        message: "/op:status done\n\nTask: alpha",
         notifyType: "info",
       });
+      const notice = yield* takeEvent(
+        (event) => event.type === "turn_item.updated" && event.turnItem.type === "system_notice",
+      );
+      assert.isTrue(
+        notice.type === "turn_item.updated" &&
+          notice.turnItem.type === "system_notice" &&
+          notice.turnItem.message === "/op:status done\n\nTask: alpha",
+      );
       yield* fake.emit({ type: "response", command: "prompt", success: true });
       // The adapter probes get_state (auto-acked idle by the fake), then
       // settles the turn as completed.

packages/provider-pi/src/server/adapter.ts

@@ -19,7 +19,7 @@
  * Extension UI: Pi extensions raise dialogs through `extension_ui_request`.
  * Dialog methods become v2 runtime requests (`confirm` → approval_request,
  * `select`/`input`/`editor` → user_input_request); answers travel back as
- * `extension_ui_response`. `notify` becomes a completed activity item.
+ * `extension_ui_response`. `notify` becomes a system notice.
  * Terminal-only decoration such as status, widget, title, and editor-text
  * updates has no matching T3 surface and is ignored.
  */
@@ -1219,13 +1219,9 @@ export const makePiAdapterV2 = Effect.fn("makePiAdapterV2")(function* (
               ...baseItemFields(turn, nativeItemId, emittedAt, emittedAt),
               status: "completed",
               completedAt: emittedAt,
-              title: "notify",
-              type: "dynamic_tool",
-              toolName: "notify",
-              input: {
-                message,
-                notifyType: recordString(event, "notifyType") ?? "info",
-              },
+              title: message,
+              type: "system_notice",
+              message,
             },
           });
           return;