fix(confidence-engine): honor openai alternate output schema

tests/llm/provider.test.js

@@ -9,6 +9,7 @@ import {
   reconstructionJsonSchema,
 } from "@/lib/llm/provider.js";
 import { reconstructionV2Schema } from "@/lib/reconstruction/schema.js";
+import { focusedDeconstructJsonSchema } from "@/lib/graph/focused-investigation.js";
 import { z } from "zod";
 
 describe("OllamaLlmProvider chat capability detection", () => {
@@ -303,6 +304,52 @@ describe("OpenAI reconstruction provider experiment seam", () => {
     });
   });
 
+  it("projects a caller-supplied focused schema for OpenAI structured output", async () => {
+    const fetchSpy = vi.fn().mockResolvedValue({
+      ok: true,
+      json: async () => ({
+        output_text: JSON.stringify({
+          targetNodeId: "target",
+          observations: [],
+          uncertainties: [],
+          assumptions: [],
+          relationships: [],
+          possibleFollowUpQuestions: [],
+        }),
+      }),
+    });
+    const provider = createOpenAIReconstructionProvider({ apiKey: "test-key", fetchImpl: fetchSpy });
+
+    const result = await provider.generateReconstruction(
+      "focused prompt",
+      "gpt-5.6-terra",
+      focusedDeconstructJsonSchema,
+    );
+    const request = JSON.parse(fetchSpy.mock.calls[0][1].body);
+    const schema = request.text.format.schema;
+
+    expect(schema.required).toEqual([
+      "targetNodeId",
+      "observations",
+      "uncertainties",
+      "assumptions",
+      "relationships",
+      "possibleFollowUpQuestions",
+    ]);
+    expect(Object.keys(schema.properties)).toEqual(schema.required);
+    expect(schema.properties).toHaveProperty("targetNodeId");
+    expect(schema.properties).not.toHaveProperty("reconstruction");
+    expect(schema.properties).not.toHaveProperty("inputClassification");
+    expect(result.response).toEqual({
+      targetNodeId: "target",
+      observations: [],
+      uncertainties: [],
+      assumptions: [],
+      relationships: [],
+      possibleFollowUpQuestions: [],
+    });
+  });
+
   it("extracts ordered output_text parts from raw Responses output", async () => {
     const provider = createOpenAIReconstructionProvider({
       apiKey: "test-key",