feat: enhance discovery, vibe sessions, and library enrichment

backend/src/app.ts

@@ -160,7 +160,7 @@ export async function buildApp(config: AppConfig) {
   const sessionDirector = new SessionDirector(dbService);
 
   fastify.register(v2Routes, { prefix: '/api', dbService, sessionDirector });
-  fastify.register(discoveryRoutes, { prefix: '/api', dbService });
+  fastify.register(discoveryRoutes, { prefix: '/api', dbService, jobService });
   // ponytail: /api/test/enqueue-job (manual job-enqueue test endpoint) removed —
   // nothing in the deployed app or its tests called it, and deployment never
   // sets NODE_ENV so an env gate would've stayed live in prod anyway.