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

lib/llm/provider.js

@@ -160,22 +160,24 @@ function zodAcceptsNull(schema) {
 function projectOpenAIStrictSchema(schema, zodSchema, rootSchema) {
   const resolved = resolveSchema(schema, rootSchema);
   const shape = zodObjectShape(zodSchema);
-  if (resolved?.properties && shape) {
+  if (resolved?.properties) {
+    if (shape) {
     for (const [key, property] of Object.entries(resolved.properties)) {
       const propertyZodSchema = shape[key];
       if (propertyZodSchema?.isOptional?.() && !schemaAllowsNull(property, rootSchema)) {
         resolved.properties[key] = { anyOf: [property, { type: "null" }] };
       }
     }
+    }
     resolved.required = Object.keys(resolved.properties);
   }
 
   if (resolved?.items) {
     projectOpenAIStrictSchema(resolved.items, zodArrayItem(zodSchema), rootSchema);
   }
-  if (resolved?.properties && shape) {
+  if (resolved?.properties) {
     for (const [key, property] of Object.entries(resolved.properties)) {
-      projectOpenAIStrictSchema(property, shape[key], rootSchema);
+      projectOpenAIStrictSchema(property, shape?.[key], rootSchema);
     }
   }
 }
@@ -458,8 +460,11 @@ class OpenAIReconstructionProvider {
     this.fetchImpl = fetchImpl;
   }
 
-  async generateReconstruction(prompt, modelName = "gpt-5.6-terra") {
+  async generateReconstruction(prompt, modelName = "gpt-5.6-terra", outputSchema) {
     if (!this.apiKey) throw new Error("OPENAI_API_KEY is not set");
+    const structuredOutputSchema = outputSchema
+      ? createOpenAIStrictSchema(outputSchema, null)
+      : openAIReconstructionJsonSchema;
 
     const response = await this.fetchImpl("https://api.openai.com/v1/responses", {
       method: "POST",
@@ -475,7 +480,7 @@ class OpenAIReconstructionProvider {
             type: "json_schema",
             name: "reconstruction",
             strict: true,
-            schema: openAIReconstructionJsonSchema,
+            schema: structuredOutputSchema,
           },
         },
       }),
@@ -501,7 +506,9 @@ class OpenAIReconstructionProvider {
     }
 
     return {
-      response: normaliseOpenAITransportResponse(recoverJson(outputText)),
+      response: outputSchema
+        ? recoverJson(outputText)
+        : normaliseOpenAITransportResponse(recoverJson(outputText)),
       providerApiPath: "/v1/responses",
     };
   }