fix: address Hermes adapter review feedback

server/src/adapters/registry.ts

@@ -227,7 +227,7 @@ export function listServerAdapters(): ServerAdapterModule[] {
 
 export async function detectAdapterModel(
   type: string,
-): Promise<{ model: string | null; provider: string | null; source: string | null } | null> {
+): Promise<{ model: string; provider: string; source: string } | null> {
   const adapter = adaptersByType.get(type);
   if (!adapter?.detectModel) return null;
   const detected = await adapter.detectModel();

server/src/routes/agents.ts

@@ -677,7 +677,7 @@ export function agentRoutes(db: Db) {
     const type = req.params.type as string;
 
     const detected = await detectAdapterModel(type);
-    res.json(detected ?? { model: null, provider: null, source: null });
+    res.json(detected);
   });
 
   router.post(