fix(confidence-engine): expose reconstruction failure evidence

tests/app/api/cases-start-route.test.js

@@ -82,6 +82,7 @@ describe("app/api/cases/start route", () => {
       error: "Provider unavailable",
       diagnostics: { modelName: "llama3" },
       statusCode: 502,
+      rawResponse: '{"reconstruction":{"summary":""}}',
     });
 
     const { POST } = await import("@/app/api/cases/start/route.js");
@@ -94,7 +95,9 @@ describe("app/api/cases/start route", () => {
     );
 
     expect(response.status).toBe(502);
-    await expect(response.json()).resolves.not.toHaveProperty("stack");
+    const body = await response.json();
+    expect(body).toHaveProperty("rawResponse");
+    expect(body.rawResponse).toBe('{"reconstruction":{"summary":""}}');
   });
 
   it("returns structured 500 on malformed JSON", async () => {

tests/graph/orchestrator.test.js

@@ -531,6 +531,7 @@ describe("lib/graph/orchestrator startCase", () => {
       analysisErrors: ["socket hang up"],
       statusCode: 502,
     });
+    expect(result).toHaveProperty("rawResponse");
   });
 
   it("returns null selectedQuestion when neither analysis nor graph path yields a question", async () => {