feat: complete evidence restructuring worktree

frontend/src/shell/AppShell.new-session.test.tsx

@@ -159,6 +159,7 @@ test("opens Workspace management from the right sidebar without interrupting the
   server.use(
     http.get("/api/workspace-registry/status", () =>
       HttpResponse.json({ branch: "main", ahead: 0, behind: 0, degraded: false })),
+    http.get("/api/health/dwh", () => HttpResponse.json({ ok: false })),
   );
   renderShell();
 
@@ -168,6 +169,21 @@ test("opens Workspace management from the right sidebar without interrupting the
   expect(screen.getByTestId("app-shell")).toHaveAttribute("data-activity-layout", "closed");
 });
 
+test("does not block the shell when the DWH is unavailable at startup", async () => {
+  let healthChecks = 0;
+  server.use(
+    http.get("/api/health/dwh", () => {
+      healthChecks += 1;
+      return HttpResponse.json({ ok: false });
+    }),
+  );
+  renderShell();
+
+  expect(await screen.findByRole("button", { name: "Workspace management" })).toBeVisible();
+  expect(screen.queryByRole("heading", { name: "Connection unavailable" })).not.toBeInTheDocument();
+  expect(healthChecks).toBe(0);
+});
+
 
 test("marks the composer as awaiting input for a pending freetext gate", () => {
   useSessionStore.setState({