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/schema.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const exportSchema = require('./lib/utils/exportSchema');
+
+const AppSchema = require('./lib/schemas/AppSchema');
+
+const validateAppDefinition = AppSchema.validate;
+
+module.exports = {
+  AppSchema,
+  validateAppDefinition,
+  exportSchema: () => exportSchema(AppSchema),
+};