experiment(confidence-engine): complete openai reconstruction apparatus

scripts/start-case-experiment-helper.cjs

@@ -62,8 +62,26 @@ async function runStartCaseExperiment(scenarioInput, experimentInstruction, opti
   }
 
   let startCase = options.startCase;
+  let reconstructionProvider = options.reconstructionProvider;
+  let reconstructionModelName = options.reconstructionModelName;
   const isMock = process.env.START_CASE_EXPERIMENT_HELPER_MOCK === "1";
 
+  if (process.env.START_CASE_EXPERIMENT_PROVIDER === "openai") {
+    if (!process.env.OPENAI_API_KEY) {
+      throw new Error(
+        "START_CASE_EXPERIMENT_PROVIDER=openai requires OPENAI_API_KEY",
+      );
+    }
+    const { createOpenAIReconstructionProvider } = await import(
+      PROJECT_ROOT + "/lib/llm/provider.js"
+    );
+    reconstructionProvider = createOpenAIReconstructionProvider({
+      apiKey: process.env.OPENAI_API_KEY,
+      fetchImpl: fetch,
+    });
+    reconstructionModelName = "gpt-5.6-terra";
+  }
+
   if (!startCase && isMock) {
     // Deterministic mode: skip environment checks and use inline test double.
     startCase = async (body) => {
@@ -100,8 +118,8 @@ async function runStartCaseExperiment(scenarioInput, experimentInstruction, opti
   const endToEndStartedAt = Date.now();
   try {
     result = await startCase(scenarioInput, {
-      reconstructionProvider: options.reconstructionProvider,
-      reconstructionModelName: options.reconstructionModelName,
+      reconstructionProvider,
+      reconstructionModelName,
     });
   } finally {
     // Clean up experiment env var after execution regardless of outcome
@@ -191,5 +209,3 @@ if (require.main === module) {
 }
 
 module.exports = { runStartCaseExperiment };
-
-module.exports = { runStartCaseExperiment };