fix(confidence-engine): supply focused deconstruction schema

tests/llm/provider.test.js

@@ -5,6 +5,7 @@ import {
   createOpenAIReconstructionProvider,
   getProvider,
   normaliseOpenAITransportResponse,
+  reconstructionJsonSchema,
 } from "@/lib/llm/provider.js";
 import { reconstructionV2Schema } from "@/lib/reconstruction/schema.js";
 import { z } from "zod";
@@ -40,11 +41,7 @@ describe("OllamaLlmProvider chat capability detection", () => {
         messages: [{ role: "user", content: "prompt" }],
         stream: false,
       });
-      expect(chatRequest.format).toBeTypeOf("object");
-      expect(chatRequest.format).not.toBe("json");
-      const formatText = JSON.stringify(chatRequest.format);
-      expect(formatText).toContain("relationship");
-      expect(formatText).toContain("evidenceType");
+      expect(chatRequest.format).toEqual(reconstructionJsonSchema);
       expect(result).toMatchObject({
         response: {},
         providerApiPath: "/api/chat",
@@ -63,6 +60,30 @@ describe("OllamaLlmProvider chat capability detection", () => {
     }
   });
 
+  it("uses a supplied structured-output schema for the chat request", async () => {
+    const originalBaseUrl = process.env.OLLAMA_BASE_URL;
+    const outputSchema = {
+      type: "object",
+      properties: { focused: { type: "string" } },
+      required: ["focused"],
+    };
+    const fetchSpy = vi.fn()
+      .mockResolvedValueOnce({ ok: true, text: async () => "" })
+      .mockResolvedValueOnce({ ok: true, json: async () => ({ message: { content: "{}" } }) });
+    vi.stubGlobal("fetch", fetchSpy);
+    process.env.OLLAMA_BASE_URL = "http://ollama.test";
+
+    try {
+      __resetChatSupportForTests();
+      await getProvider().generateReconstruction("prompt", "configured-model", outputSchema);
+      expect(JSON.parse(fetchSpy.mock.calls[1][1].body).format).toEqual(outputSchema);
+    } finally {
+      vi.unstubAllGlobals();
+      if (originalBaseUrl === undefined) delete process.env.OLLAMA_BASE_URL;
+      else process.env.OLLAMA_BASE_URL = originalBaseUrl;
+    }
+  });
+
   it("reports chat-skipped generate fallback execution", async () => {
     const originalBaseUrl = process.env.OLLAMA_BASE_URL;
     const fetchSpy = vi.fn()