Show complete native subagent conversations (#2760)

* fix(server): preserve provider subagent messages

The provider SDK defaults to forwarding only child tool activity, which leaves the nested timeline without the child response. Request the full nested transcript so provider subagent panes retain both sides of the conversation.

* fix(app): correct project status badge test imports

packages/app/e2e/browser/provider-subagents.real.spec.ts

@@ -75,6 +75,9 @@ test.describe("real provider subagent timelines", () => {
 
         const panel = page.getByTestId("provider-subagent-panel");
         await expect(panel).toBeVisible({ timeout: 30_000 });
+        await expect(
+          panel.getByTestId("user-message").filter({ hasText: scenario.sentinel }),
+        ).toBeVisible({ timeout: 30_000 });
         await expect(
           panel.getByTestId("assistant-message").filter({ hasText: scenario.sentinel }),
         ).toBeVisible({ timeout: 30_000 });

packages/app/e2e/helpers/project-status-badge.ts

@@ -1,7 +1,7 @@
 import { expect, type Page } from "@playwright/test";
-import { gotoAppShell } from "./app";
-import { seedWorkspace, type SeededWorkspace } from "./seed-client";
-import { waitForSidebarHydration } from "./workspace-ui";
+import { gotoAppShell } from "../support/helpers/app";
+import { seedWorkspace, type SeededWorkspace } from "../support/helpers/seed-client";
+import { waitForSidebarHydration } from "../support/helpers/workspace-ui";
 
 export interface StatusProject {
   seed: SeededWorkspace;

packages/app/e2e/project-status-badge.spec.ts

@@ -1,4 +1,4 @@
-import { test } from "./fixtures";
+import { test } from "./support/fixtures";
 import {
   expandStatusProject,
   expectCollapsedProjectStatus,