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/FunctionSourceSchema.js

@@ -0,0 +1,37 @@
+'use strict';
+
+const makeSchema = require('../utils/makeSchema');
+
+module.exports = makeSchema({
+  id: '/FunctionSourceSchema',
+  description:
+    'Source code like `{source: "return 1 + 2"}` which the system will wrap in a function for you.',
+  type: 'object',
+  required: ['source'],
+  properties: {
+    source: {
+      type: 'string',
+      pattern: 'return',
+      description:
+        'JavaScript code for the function body. This must end with a `return` statement.',
+    },
+    args: {
+      type: 'array',
+      items: { type: 'string' },
+      description:
+        "Function signature. Defaults to `['z', 'bundle']` if not specified.",
+    },
+  },
+  additionalProperties: false,
+  examples: [
+    { source: 'return 1 + 2' },
+    { args: ['x', 'y'], source: 'return x + y;' },
+  ],
+  antiExamples: [
+    {
+      example: { source: '1 + 2' },
+      reason:
+        'Invalid value for key: source (must end with a `return` statement)',
+    },
+  ],
+});