fix(confidence-engine): preserve scenario during outage

tests/ui/scenario-form.test.jsx

@@ -14,7 +14,9 @@ import ReasoningWorkspace, {
 } from "@/components/reasoning-workspace.jsx";
 import {
   ScenarioResultPanels,
+  UnavailableStartPanel,
   UpdateErrorPanel,
+  isUnavailableStartResponse,
   submitAnswerForUpdateCase,
   submitScenarioForStartCase,
 } from "@/components/scenario-form.jsx";
@@ -372,6 +374,26 @@ function makeCommercialUpdateSuccess(overrides = {}) {
 }
 
 describe("scenario-form UI helpers", () => {
+  it("recognises only the established sanitized unavailable start response", () => {
+    expect(isUnavailableStartResponse(
+      { status: 503 },
+      { success: false, error: "Reasoning service is temporarily unavailable." },
+    )).toBe(true);
+    expect(isUnavailableStartResponse(
+      { status: 500 },
+      { success: false, error: "Reasoning service is temporarily unavailable." },
+    )).toBe(false);
+  });
+
+  it("presents generic recovery without provider details", () => {
+    const html = renderToStaticMarkup(<UnavailableStartPanel onRetry={vi.fn()} />);
+
+    expect(html).toContain("Confidence Engine is temporarily unavailable.");
+    expect(html).toContain("Your scenario is still here and you can try again.");
+    expect(html).toContain(">Retry<");
+    expect(html).not.toMatch(/ollama|provider|local model|server|infrastructure/i);
+  });
+
   it("submits to /api/cases/start", async () => {
     const fetchImpl = vi.fn().mockResolvedValue({ ok: true });