fix(examples): fix tsconfig, port validation, and README lint

- Change module from ESNext to NodeNext in tsconfig
- Add VALKEY_PORT validation (integer, 1-65535 range)
- Add text language identifier to fenced code block (MD040)

Signed-off-by: Riley Des <riley.desserre@improving.com>

Author: rileydes-improving

examples/with-valkey-store/README.md

@@ -47,7 +47,7 @@ This example demonstrates how to use **Valkey** as a distributed backing store f
 
 ## Structure
 
-```
+```text
 examples/with-valkey-store
 ├── src/
 │   ├── agents/assistant.ts    # Example agent definition

examples/with-valkey-store/src/index.ts

@@ -15,8 +15,18 @@ const logger = createPinoLogger({
 });
 
 const host = process.env.VALKEY_HOST ?? "localhost";
-const port = Number(process.env.VALKEY_PORT ?? 6379);
+const rawPort = process.env.VALKEY_PORT;
+const port = rawPort !== undefined ? Number(rawPort) : 6379;
+if (!Number.isInteger(port) || port < 1 || port > 65535) {
+  throw new Error(`Invalid VALKEY_PORT "${rawPort}": must be an integer between 1 and 65535`);
+}
 
+/**
+ * Bootstraps a VoltAgent instance backed by Valkey for both A2A task
+ * persistence and resumable streaming. Connects to the Valkey server
+ * specified by `VALKEY_HOST` / `VALKEY_PORT` environment variables
+ * (defaulting to `localhost:6379`), then starts an HTTP server on port 3141.
+ */
 async function main() {
   const valkeyClient = await GlideClient.createClient({
     addresses: [{ host, port }],

examples/with-valkey-store/tsconfig.json

@@ -3,7 +3,7 @@
   "compilerOptions": {
     "rootDir": "src",
     "outDir": "dist",
-    "module": "ESNext",
+    "module": "NodeNext",
     "moduleResolution": "NodeNext",
     "target": "ES2022",
     "types": ["node"],