experiment(confidence-engine): route UI journey provider centrally

lib/analysis.js

@@ -4,7 +4,7 @@
  */
 
 import { getConfig } from "../lib/config.js";
-import { getProvider } from "../lib/llm/provider.js";
+import { getProvider, getProviderModelName } from "../lib/llm/provider.js";
 import {
   buildPrompt,
   PROMPT_VERSIONS,
@@ -52,7 +52,6 @@ export async function analyseScenario(scenario, opts = {}) {
     return buildErrorResponse("Invalid server configuration", startTime, "500");
   }
 
-  const { OLLAMA_BASE_URL: _ignored, OLLAMA_MODEL } = configResult.config;
   const promptVersion = opts.promptVersion || DEFAULT_PROMPT_VERSION;
 
   // ── Build prompt (experiment seam via env var bridge) ──
@@ -73,7 +72,7 @@ export async function analyseScenario(scenario, opts = {}) {
 
   // ── Call provider ──────────────────────────────────
   const provider = opts.reconstructionProvider ?? getProvider();
-  const reconstructionModelName = opts.reconstructionModelName ?? OLLAMA_MODEL;
+  const reconstructionModelName = opts.reconstructionModelName ?? getProviderModelName();
   let rawResponse;
   let providerApiPath;
   let providerExecution;

lib/config.js

@@ -5,7 +5,29 @@ const envSchema = z.object({
   OLLAMA_MODEL: z.string().min(1),
 });
 
+const openAIExperimentEnvSchema = z.object({
+  OPENAI_API_KEY: z.string().min(1),
+});
+
+export const OPENAI_UI_JOURNEY_EXPERIMENT_PROVIDER = "openai";
+export const OPENAI_TERRA_MODEL = "gpt-5.6-terra";
+
+export function isOpenAIUiJourneyExperiment() {
+  return process.env.CONFIDENCE_ENGINE_EXPERIMENT_PROVIDER === OPENAI_UI_JOURNEY_EXPERIMENT_PROVIDER;
+}
+
 export function getConfig() {
+  if (isOpenAIUiJourneyExperiment()) {
+    const parsed = openAIExperimentEnvSchema.safeParse({
+      OPENAI_API_KEY: process.env.OPENAI_API_KEY,
+    });
+    if (!parsed.success) return { ok: false, error: parsed.error.flatten().fieldErrors };
+    return {
+      ok: true,
+      config: { provider: OPENAI_UI_JOURNEY_EXPERIMENT_PROVIDER, modelName: OPENAI_TERRA_MODEL },
+    };
+  }
+
   const parsed = envSchema.safeParse({
     OLLAMA_BASE_URL: process.env.OLLAMA_BASE_URL,
     OLLAMA_MODEL: process.env.OLLAMA_MODEL,
@@ -15,7 +37,7 @@ export function getConfig() {
     return { ok: false, error: parsed.error.flatten().fieldErrors };
   }
 
-  return { ok: true, config: parsed.data };
+  return { ok: true, config: { ...parsed.data, provider: "ollama", modelName: parsed.data.OLLAMA_MODEL } };
 }
 
 export function assertConfig() {

lib/graph/orchestrator.js

@@ -5,7 +5,7 @@
 
 import { analyseScenario } from "../analysis.js";
 import { assertConfig } from "../config.js";
-import { getProvider } from "../llm/provider.js";
+import { getProvider, getProviderModelName } from "@/lib/llm/provider.js";
 import {
   makeGraph,
   startCaseRequestSchema,
@@ -666,8 +666,8 @@ async function updateCaseWithDependencies(body, dependencies = {}) {
   const startedAt = Date.now();
 
   try {
-    const config = dependencies.config ?? assertConfig();
-    modelName = config.OLLAMA_MODEL;
+    if (!dependencies.config) assertConfig();
+    modelName = dependencies.modelName ?? dependencies.config?.modelName ?? dependencies.config?.OLLAMA_MODEL ?? getProviderModelName();
 
     const prompt = buildPrompt({
       situationGraph,
@@ -1185,7 +1185,7 @@ export async function reconsiderCompletedEpisode(epiParams, deps = {}) {
   try {
     // Preserve original priority (deps.modelName > deps.config.OLLAMA_MODEL > getModelName) with assertConfig fallback only when no deps provide a model
     let resolvedConfig = undefined;
-    if (deps.modelName == null && deps.config?.OLLAMA_MODEL == null && deps.config !== null) {
+      if (deps.modelName == null && deps.config?.OLLAMA_MODEL == null && deps.config?.modelName == null && deps.config !== null) {
       const hasOtherDeps = Object.keys(deps).some((k) => k !== "config" && k !== "modelName");
       if (hasOtherDeps) {
         resolvedConfig = undefined; // don't call assertConfig when deps is non-empty with other keys
@@ -1196,8 +1196,9 @@ export async function reconsiderCompletedEpisode(epiParams, deps = {}) {
     const config = deps.config ?? resolvedConfig;
     modelName =
       deps.modelName ??
-      (config != null ? config.OLLAMA_MODEL : undefined) ??
+        (config != null ? (config.modelName ?? config.OLLAMA_MODEL) : undefined) ??
       getModelName?.() ??
+        getProviderModelName() ??
       null;
 
     const promptBuilder = buildEpisodePrompt ?? buildEpisodeAwareGraphPrompt;

lib/llm/provider.js

@@ -1,5 +1,6 @@
 import { z } from "zod";
 import { reconstructionV2Schema } from "../reconstruction/schema.js";
+import { isOpenAIUiJourneyExperiment, OPENAI_TERRA_MODEL } from "../config.js";
 
 /**
  * Provider abstraction — the app calls getProvider() which returns an object
@@ -9,9 +10,15 @@ import { reconstructionV2Schema } from "../reconstruction/schema.js";
  */
 
 export function getProvider() {
+  if (isOpenAIUiJourneyExperiment()) return createOpenAIReconstructionProvider();
   return new OllamaLlmProvider();
 }
 
+/** Server-owned model resolution for the configured application provider. */
+export function getProviderModelName() {
+  return isOpenAIUiJourneyExperiment() ? OPENAI_TERRA_MODEL : process.env.OLLAMA_MODEL ?? null;
+}
+
 /**
  * Experiment-only construction seam. Production provider selection remains Ollama.
  * @param {{ apiKey?: string, fetchImpl?: typeof fetch }} [options]