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/schema/lib/functional-constraints/labelWhenVisible.js

@@ -0,0 +1,31 @@
+const _ = require('lodash');
+const jsonschema = require('jsonschema');
+
+const actionTypes = ['triggers', 'searches', 'creates', 'bulkReads'];
+
+const labelWhenVisible = (definition) => {
+  const errors = [];
+
+  for (const actionType of actionTypes) {
+    const group = definition[actionType] || {};
+    _.each(group, (action, key) => {
+      const { display } = action;
+      if (!display.hidden && !(display.label && display.description)) {
+        errors.push(
+          new jsonschema.ValidationError(
+            `visible actions must have a label and description`,
+            action,
+            `/BasicDisplaySchema`,
+            `instance.${actionType}.${key}.display`,
+            'invalid',
+            'key',
+          ),
+        );
+      }
+    });
+  }
+
+  return errors;
+};
+
+module.exports = labelWhenVisible;