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

app/api/cases/overview/route.js

@@ -6,7 +6,7 @@
  * Thin route pattern — no overview business logic here.
  */
 
-import { getProvider } from "@/lib/llm/provider.js";
+import { getProvider, getProviderModelName } from "@/lib/llm/provider.js";
 import { synthesizeInvestigationOverview } from "@/lib/graph/investigation-overview-synthesis.js";
 
 export async function POST(request) {
@@ -33,7 +33,7 @@ export async function POST(request) {
       { situationGraph, findings, plausibleInterpretations },
       {
         provider: getProvider(),
-        modelName: process.env.OLLAMA_MODEL ?? null,
+        modelName: getProviderModelName(),
       }
     );
 

app/api/cases/synthesis/route.js

@@ -9,7 +9,7 @@
  * No synthesis business logic belongs in this file.
  */
 
-import { getProvider } from "@/lib/llm/provider.js";
+import { getProvider, getProviderModelName } from "@/lib/llm/provider.js";
 import { synthesizeCurrentUnderstanding } from "@/lib/graph/current-understanding-synthesis.js";
 
 export async function POST(request) {
@@ -38,7 +38,7 @@ export async function POST(request) {
       { situationGraph, findings },
       {
         provider: getProvider(),
-        modelName: process.env.OLLAMA_MODEL ?? null,
+        modelName: getProviderModelName(),
       }
     );
 

app/api/focused-investigation/deconstruct/route.js

@@ -1,4 +1,4 @@
-import { getProvider } from "@/lib/llm/provider";
+import { getProvider, getProviderModelName } from "@/lib/llm/provider";
 import {
   buildFocusedDeconstructPrompt,
   focusedDeconstructJsonSchema,
@@ -58,7 +58,7 @@ export async function POST(request) {
     const startedAt = Date.now();
     const wrapper = await provider.generateReconstruction(
       prompt,
-      process.env.OLLAMA_MODEL,
+      getProviderModelName(),
       focusedDeconstructJsonSchema,
     );
     const elapsedMs = Date.now() - startedAt;