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/http_example.js

@@ -0,0 +1,26 @@
+#!/usr/bin/env node
+/**
+ * HTTP Example Action - Node.js Example Pack
+ *
+ * Demonstrates using the `node-fetch` library to make an HTTP call to example.com.
+ * Receives parameters via the Node.js wrapper (stdin JSON with code_path).
+ */
+
+const fetch = require("node-fetch");
+
+async function run(params) {
+  const url = params.url || "https://example.com";
+
+  const response = await fetch(url, { timeout: 10000 });
+  const text = await response.text();
+
+  return {
+    status_code: response.status,
+    url: response.url,
+    content_length: text.length,
+    snippet: text.slice(0, 500),
+    success: response.ok,
+  };
+}
+
+module.exports = { run };