Milestone 0: import zappier billing, Verae middleware, and Zapier research

Compose-ready workspace: packages/zappier (rate card, portal, Stripe),
packages/verae-zapier-middleware (timestamp + NATS), packages/verae-zapier
(CLI app), vendor/zapier-platform, and research/zapier vendor corpus.

Gate 0 structure checks pass. Product code and research are not yet wired.

vendor/zapier-platform/packages/legacy-scripting-runner/$.js

@@ -0,0 +1,34 @@
+const jQuery = require('jquery');
+const { DOMParser } = require('@xmldom/xmldom');
+const { jsdom } = require('jsdom');
+
+const window = jsdom().defaultView;
+window.DOMParser = DOMParser;
+
+const $ = jQuery(window);
+
+$.parseXML = (data) => {
+  if (!data || typeof data !== 'string') {
+    return null;
+  }
+
+  let xml;
+
+  try {
+    xml = new DOMParser().parseFromString(data, 'text/xml');
+  } catch (e) {
+    // We can safely ignore this
+  }
+
+  if (
+    !xml ||
+    !xml.documentElement ||
+    xml.getElementsByTagName('parsererror').length
+  ) {
+    throw new Error(`Invalid XML: ${data}`);
+  }
+
+  return xml;
+};
+
+module.exports = $;