fix: resolve race condition entre Kernel e Casa de Máquinas

- Move início do Kernel ANTES do servidor HTTP (porta 5000)
- Adiciona retry com exponential backoff na consulta ao Registry
- Garante que Registry esteja pronto antes de receber requisições

Fixes: Casa de Máquinas mostrava 0/0 serviços porque API
chamava Registry antes do Kernel iniciar na porta 5001

server/engine-room/routes.ts

@@ -10,7 +10,23 @@ import http from "http";
 
 // Consulta Registry do Kernel para serviços descobertos
 // Usa http.get em vez de fetch por causa de problemas com loopback no Node.js
-async function fetchRegistryServices(): Promise<any[] | null> {
+// Implementa retry com backoff para maior resiliência
+async function fetchRegistryServicesWithRetry(maxRetries = 3, delay = 500): Promise<any[] | null> {
+  for (let attempt = 1; attempt <= maxRetries; attempt++) {
+    const result = await fetchRegistryServicesOnce();
+    if (result !== null) {
+      return result;
+    }
+    if (attempt < maxRetries) {
+      console.log(`[Engine Room] Tentativa ${attempt} falhou, aguardando ${delay}ms...`);
+      await new Promise(r => setTimeout(r, delay));
+      delay *= 2; // Exponential backoff
+    }
+  }
+  return null;
+}
+
+async function fetchRegistryServicesOnce(): Promise<any[] | null> {
   return new Promise((resolve) => {
     const options = {
       hostname: '127.0.0.1',
@@ -90,7 +106,7 @@ export function registerEngineRoomRoutes(app: Express): void {
         return res.status(401).json({ error: "Not authenticated" });
       }
 
-      const registryServices = await fetchRegistryServices();
+      const registryServices = await fetchRegistryServicesWithRetry();
       const engines: any[] = [];
       
       if (registryServices && registryServices.length > 0) {
@@ -131,7 +147,7 @@ export function registerEngineRoomRoutes(app: Express): void {
 
   // Lista de engines - APENAS do Registry
   app.get("/api/engine-room/engines", async (_req: Request, res: Response) => {
-    const registryServices = await fetchRegistryServices();
+    const registryServices = await fetchRegistryServicesWithRetry();
     const engines = registryServices?.map(mapRegistryToEngine) || [];
     
     res.json({
@@ -233,7 +249,7 @@ export function registerEngineRoomRoutes(app: Express): void {
         return res.status(401).json({ error: "Not authenticated" });
       }
 
-      const registryServices = await fetchRegistryServices();
+      const registryServices = await fetchRegistryServicesWithRetry();
       const service = registryServices?.find((s: any) => s.id === req.params.name || s.name === req.params.name);
       
       if (!service) {

server/index.ts

@@ -395,24 +395,8 @@ export function log(message: string, source = "express") {
     await setupVite(httpServer, app);
   }
 
-  // ALWAYS serve the app on the port specified in the environment variable PORT
-  // Other ports are firewalled. Default to 5000 if not specified.
-  // this serves both the API and the client.
-  // It is the only port that is not firewalled.
-  const port = parseInt(process.env.PORT || "5000", 10);
-  httpServer.listen(
-    {
-      port,
-      host: "0.0.0.0",
-      reusePort: true,
-    },
-    () => {
-      log(`serving on port ${port}`);
-    },
-  );
-
   // Inicia Arcadia Kernel (Dashboard porta 5001) - Semana 3
-  // Só inicia se KERNEL_ENABLED estiver setado
+  // Inicia ANTES do servidor HTTP para garantir que o Registry esteja pronto
   if (process.env.KERNEL_ENABLED === 'true') {
     try {
       const kernel = new ArcadiaKernel({
@@ -427,4 +411,21 @@ export function log(message: string, source = "express") {
   } else {
     log('Kernel desabilitado (set KERNEL_ENABLED=true para ativar)');
   }
+
+  // ALWAYS serve the app on the port specified in the environment variable PORT
+  // Other ports are firewalled. Default to 5000 if not specified.
+  // this serves both the API and the client.
+  // It is the only port that is not firewalled.
+  // INICIA DEPOIS do Kernel para garantir que o Registry esteja pronto
+  const port = parseInt(process.env.PORT || "5000", 10);
+  httpServer.listen(
+    {
+      port,
+      host: "0.0.0.0",
+      reusePort: true,
+    },
+    () => {
+      log(`serving on port ${port}`);
+    },
+  );
 })();