refactor(vibe): simplify durable session flow

backend/src/app.ts

@@ -14,7 +14,6 @@ import quarantineRoutes from './routes/quarantine.routes.js';
 import settingsRoutes from './routes/settings.routes.js';
 import graphRoutes from './routes/graph.routes.js';
 import { SessionDirector } from './services/session-director.service.js';
-import v2Routes from './routes/v2.routes.js';
 import vibeSessionsRoutes from './routes/vibe-sessions.routes.js';
 import discoveryRoutes from './routes/discovery.routes.js';
 import imagesRoutes from './routes/images.routes.js';
@@ -161,16 +160,10 @@ export async function buildApp(config: AppConfig) {
 
   const sessionDirector = new SessionDirector(dbService);
   const vibeSessionCoordinator = new VibeSessionCoordinator(dbService, sessionDirector);
-  // Durable sessions intentionally do not trust x-user-id.  A self-hosted
-  // deployment may configure one owner through MUZICK_VIBE_USER_ID today;
-  // an authenticated deployment can replace this resolver at registration.
-  const vibeOwnerId = process.env.MUZICK_VIBE_USER_ID?.trim() || null;
 
-  fastify.register(v2Routes, { prefix: '/api', dbService, sessionDirector });
   fastify.register(vibeSessionsRoutes, {
     prefix: '/api',
     coordinator: vibeSessionCoordinator,
-    identityResolver: () => vibeOwnerId,
   });
   fastify.register(discoveryRoutes, { prefix: '/api', dbService, jobService });
   // ponytail: /api/test/enqueue-job (manual job-enqueue test endpoint) removed —