fix(confidence-engine): resolve synthesis model configuration

app/api/cases/synthesis/route.js

@@ -33,10 +33,13 @@ export async function POST(request) {
       );
     }
 
-    // ── Invoke domain seam with provider resolution ───────────
+    // ── Invoke domain seam with configured model ──────────────
     const result = await synthesizeCurrentUnderstanding(
       { situationGraph, findings },
-      { provider: getProvider() }
+      {
+        provider: getProvider(),
+        modelName: process.env.OLLAMA_MODEL ?? null,
+      }
     );
 
     return Response.json({ success: true, currentUnderstanding: result.currentUnderstanding }, { status: 200 });