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/FunctionSchema.js

@@ -0,0 +1,42 @@
+'use strict';
+
+const makeSchema = require('../utils/makeSchema');
+
+const FunctionRequireSchema = require('./FunctionRequireSchema');
+const FunctionSourceSchema = require('./FunctionSourceSchema');
+
+module.exports = makeSchema(
+  {
+    id: '/FunctionSchema',
+    description:
+      'Internal pointer to a function from the original source or the source code itself. Encodes arity and if `arguments` is used in the body. Note - just write normal functions and the system will encode the pointers for you. Or, provide {source: "return 1 + 2"} and the system will wrap in a function for you.',
+    oneOf: [
+      { type: 'string', pattern: '^\\$func\\$\\d+\\$[tf]\\$$' },
+      { $ref: FunctionRequireSchema.id },
+      { $ref: FunctionSourceSchema.id },
+    ],
+    examples: [
+      '$func$0$f$',
+      '$func$2$t$',
+      { source: 'return 1 + 2' },
+      { require: 'some/path/to/file.js' },
+    ],
+    antiExamples: [
+      {
+        example: 'funcy',
+        reason: 'Invalid function reference',
+      },
+      {
+        example: { source: '1 + 2' },
+        reason:
+          'Invalid value for key: source (must end with a `return` statement)',
+      },
+      {
+        example: { source: '1 + 2', require: 'some/path/to/file.js' },
+        reason:
+          'Must be either /FunctionRequireSchema _or_ /FunctionSourceSchema',
+      },
+    ],
+  },
+  [FunctionRequireSchema, FunctionSourceSchema],
+);