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/schemas/MiddlewaresSchema.js

@@ -0,0 +1,35 @@
+'use strict';
+
+const { SKIP_KEY } = require('../constants');
+const makeSchema = require('../utils/makeSchema');
+const FunctionSchema = require('./FunctionSchema');
+
+module.exports = makeSchema(
+  {
+    id: '/MiddlewaresSchema',
+    description:
+      'List of before or after middlewares. Can be an array of functions or a single function',
+    oneOf: [
+      {
+        type: 'array',
+        items: { $ref: FunctionSchema.id },
+      },
+      { $ref: FunctionSchema.id },
+    ],
+    additionalProperties: false,
+    examples: [
+      {
+        [SKIP_KEY]: true, // TODO fix this
+        require: 'some/path/to/file.js',
+      },
+      [{ require: 'some/path/to/file.js' }],
+    ],
+    antiExamples: [
+      {
+        example: {},
+        reason: 'Does not match either /FunctionSchema or an array of such',
+      },
+    ],
+  },
+  [FunctionSchema],
+);