experiment(confidence-engine): expose reconstruction provider seam

tests/scripts/start-case-experiment-helper.test.js

@@ -14,10 +14,12 @@ import { execFile } from "child_process";
 import { writeFile, unlink } from "fs/promises";
 import { join, dirname } from "path";
 import { fileURLToPath } from "url";
+import { createRequire } from "module";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const rootDir = join(__dirname, "..", "..");
 const helperPath = join(rootDir, "scripts", "start-case-experiment-helper.cjs");
+const require = createRequire(import.meta.url);
 
 function runHelper(args = [], envOverrides = {}) {
   return new Promise((resolve, reject) => {
@@ -128,6 +130,34 @@ describe("start-case-experiment-helper.cjs apparatus", () => {
   // ── D — Success output ──────────────────────────────────────────
 
   describe("D — success output", () => {
+    it("forwards an explicit reconstruction provider through the startCase path", async () => {
+      const { runStartCaseExperiment } = require(helperPath);
+      const reconstructionProvider = { generateReconstruction() {} };
+      const startCase = async (input, dependencies) => {
+        expect(input).toEqual({ scenario: "Provider seam scenario" });
+        expect(dependencies).toMatchObject({
+          reconstructionProvider,
+          reconstructionModelName: "gpt-5.6-terra",
+        });
+        return {
+          success: true,
+          situationGraph: { nodes: [], edges: [] },
+          assessment: null,
+          selectedQuestion: null,
+          summary: "test",
+        };
+      };
+
+      const result = await runStartCaseExperiment(
+        { scenario: "Provider seam scenario" },
+        null,
+        { reconstructionProvider, reconstructionModelName: "gpt-5.6-terra", startCase },
+      );
+
+      expect(result.success).toBe(true);
+      expect(result.summary).toBe("test");
+    });
+
     it("exit code is 0", async () => {
       const result = await runHelper(["Success test scenario"]);
       expect(result.exitCode).toBe(0);