Initial commit: Node.js Example Pack for Attune

Includes:
- 3 Node.js actions (hello, http_example, read_counter)
- 1 counter trigger type
- 1 counter sensor (Node.js, keystore-backed, per-rule state)
- 1 example rule (count_and_log)
- package.json with node-fetch and amqplib
- README with full usage documentation

actions/hello.js

@@ -0,0 +1,30 @@
+#!/usr/bin/env node
+/**
+ * Hello Action - Node.js Example Pack
+ *
+ * A minimal Node.js action that returns "Hello, Node.js".
+ * Demonstrates the basic structure of a Node.js action in Attune.
+ *
+ * When invoked via the Node.js wrapper, the `run` export is called
+ * with the action parameters as its argument.
+ */
+
+"use strict";
+
+/**
+ * Return a simple greeting message.
+ * @param {object} params - Action parameters (unused).
+ * @returns {{ message: string }}
+ */
+function run(params) {
+  return { message: "Hello, Node.js" };
+}
+
+// Direct execution support (without the wrapper)
+if (require.main === module) {
+  const result = run({});
+  process.stdout.write(JSON.stringify({ result, status: "success" }) + "\n");
+  process.exit(0);
+}
+
+module.exports = { run };