feat(confidence-engine): expose initial reconstruction evidence

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

@@ -33,9 +33,33 @@ describe("app/api/cases/start route", () => {
   });
 
   it("returns 200 on success", async () => {
+    const reconstruction = {
+      summary: "Validated reconstruction summary",
+      relationships: [
+        {
+          id: "r1",
+          fromId: "u-intervention",
+          toId: "u-problem",
+          relationship: "depends_on",
+          description: "The intervention depends on the unresolved problem.",
+          confidence: "high",
+        },
+      ],
+    };
     mockStartCase.mockResolvedValue({
       success: true,
-      situationGraph: { nodes: [{ id: "n1" }], edges: [] },
+      reconstruction,
+      situationGraph: {
+        nodes: [{ id: "n1" }],
+        edges: [
+          {
+            id: "e-unrelated",
+            fromNodeId: "n1",
+            toNodeId: "n1",
+            relationship: "supports",
+          },
+        ],
+      },
       selectedQuestion: null,
       diagnostics: {},
     });
@@ -50,6 +74,10 @@ describe("app/api/cases/start route", () => {
     );
 
     expect(response.status).toBe(200);
+    await expect(response.json()).resolves.toMatchObject({
+      success: true,
+      reconstruction,
+    });
   });
 
   it("returns 400 for invalid request input", async () => {