refactor(serve): WS client calls app.fetch directly, no HTTP server in gateway mode

- WS client receives app.fetch function instead of localPort
- Gateway mode no longer starts a local HTTP server
- Local-only mode (no secret) still starts HTTP server as before
- Removes unnecessary HTTP round-trip for gateway requests

packages/cli-workflow/src/commands/serve/serve.ts

@@ -16,9 +16,8 @@ const HEARTBEAT_INTERVAL_MS = 60_000;
 export function startServer(
   storageRoot: string,
   options: ServeOptions,
-  agentToken: string | null,
 ): void {
-  const app = createApp(storageRoot, agentToken);
+  const app = createApp(storageRoot, null);
 
   const server = serve({
     fetch: app.fetch,
@@ -95,33 +94,32 @@ export async function dispatchServe(storageRoot: string, argv: string[]): Promis
 
   if (options.gatewaySecret === "") {
     // No gateway — local-only mode
-    startServer(storageRoot, options, null);
+    startServer(storageRoot, options);
     printCliLine("no WORKFLOW_GATEWAY_SECRET — running in local-only mode");
     await new Promise(() => {});
     return 0;
   }
 
+  // Gateway mode — no HTTP server, WS client calls app.fetch directly
   const agentToken = randomUUID();
-  startServer(storageRoot, options, agentToken);
+  const app = createApp(storageRoot, agentToken);
 
-  // Start WebSocket reverse connection to gateway
   const log = createLogger({ sink: { kind: "stderr" } });
   const stopWsClient = startGatewayWsClient({
     gatewayUrl: options.gatewayUrl,
     name: options.name,
     secret: options.gatewaySecret,
-    localPort: options.port,
+    appFetch: app.fetch,
     log,
   });
 
-  printCliLine("connected to gateway via WebSocket");
+  printCliLine("connected to gateway via WebSocket (no local HTTP server)");
 
   // Register with gateway for discovery
-  const localUrl = `http://127.0.0.1:${options.port}`;
   const registered = await registerWithGateway(
     options.gatewayUrl,
     options.name,
-    localUrl,
+    `ws://${options.name}`,
     options.gatewaySecret,
     agentToken,
   );
@@ -132,7 +130,7 @@ export async function dispatchServe(storageRoot: string, argv: string[]): Promis
   const heartbeatTimer = startHeartbeat(
     options.gatewayUrl,
     options.name,
-    localUrl,
+    `ws://${options.name}`,
     options.gatewaySecret,
     agentToken,
     HEARTBEAT_INTERVAL_MS,

packages/cli-workflow/src/commands/serve/ws-client.ts

@@ -5,7 +5,7 @@ export type GatewayWsClientParams = {
   gatewayUrl: string;
   name: string;
   secret: string;
-  localPort: number;
+  appFetch: (request: Request) => Response | Promise<Response>;
   log: LogFn;
 };
 
@@ -44,20 +44,17 @@ async function handleGatewayMessage(
     params.log("ZM8K2PQ1", "gateway WebSocket dropped non-request message");
     return;
   }
-  const localUrl = `http://127.0.0.1:${String(params.localPort)}${req.path}`;
-  const initHeaders = new Headers();
-  for (const [k, v] of Object.entries(req.headers)) {
-    initHeaders.set(k, v);
-  }
+  const localUrl = `http://localhost${req.path}`;
+  const headers = new Headers(req.headers);
   let resp: Response;
   try {
-    resp = await fetch(localUrl, {
+    resp = await params.appFetch(new Request(localUrl, {
       method: req.method,
-      headers: initHeaders,
+      headers,
       body: req.body === null ? undefined : req.body,
-    });
+    }));
   } catch (e) {
-    params.log("R4N7BQ3C", `local proxy fetch failed: ${String(e)}`);
+    params.log("R4N7BQ3C", `app.fetch failed: ${String(e)}`);
     const errBody: WsResponse = {
       id: req.id,
       status: 502,