fix: harden workflow console runtime

web/apps/server/src/index.ts

@@ -1,5 +1,7 @@
-import { Effect, Layer } from "effect";
+import { Effect } from "effect";
 import { serve } from "@hono/node-server";
+import * as fs from "node:fs";
+import * as path from "node:path";
 import { fileURLToPath } from "node:url";
 import {
   WorkflowRpc,
@@ -19,6 +21,13 @@ const hostname = process.env.WEB_HOST ?? "127.0.0.1";
 
 const liveLayer = makeWorkflowRpcLayer();
 const consoleRoot = fileURLToPath(new URL("../../console/dist", import.meta.url));
+const consoleIndex = path.join(consoleRoot, "index.html");
+const staticConsoleRoot = fs.existsSync(consoleIndex) ? consoleRoot : undefined;
+if (!staticConsoleRoot) {
+  // In dev, Vite serves the console and proxies /api to this server. A missing
+  // dist directory should not prevent the API proxy from starting.
+  console.warn(`console dist not found; serving API only: ${consoleRoot}`);
+}
 
 const runOperation: RunOperation = async (
   operation: OperationName,
@@ -30,12 +39,31 @@ const runOperation: RunOperation = async (
     return yield* execute(operation, target, params);
   }).pipe(Effect.provide(liveLayer), Effect.runPromise);
 
-const app = createApp({ runOperation, consoleRoot });
+let app: ReturnType<typeof createApp>;
+try {
+  app = createApp({
+    runOperation,
+    ...(staticConsoleRoot ? { consoleRoot: staticConsoleRoot } : {}),
+  });
+} catch (error) {
+  const message = error instanceof Error ? error.message : String(error);
+  console.error(`Failed to start workflow console server: ${message}`);
+  process.exit(1);
+}
 
-serve({
+const server = serve({
   fetch: app.fetch,
   hostname,
   port,
 });
 
 console.log(`workflow console server listening on http://${hostname}:${port}`);
+
+const shutdown = (signal: NodeJS.Signals) => {
+  console.log(`received ${signal}, stopping workflow console server`);
+  server.close(() => process.exit(0));
+  setTimeout(() => process.exit(1), 5_000).unref();
+};
+
+process.once("SIGINT", shutdown);
+process.once("SIGTERM", shutdown);