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/InputFieldGroupSchema.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const makeSchema = require('../utils/makeSchema');
+
+const KeySchema = require('./KeySchema');
+
+module.exports = makeSchema(
+  {
+    id: '/InputFieldGroupSchema',
+    description: 'Object for visual grouping of input fields.',
+    type: 'object',
+    required: ['key'],
+    properties: {
+      key: {
+        description: 'The unique identifier for this group.',
+        $ref: KeySchema.id,
+      },
+      label: {
+        description: 'The human-readable name for the group.',
+        type: 'string',
+        minLength: 1,
+      },
+      emphasize: {
+        description:
+          'Whether this group should be visually emphasized in the UI.',
+        type: 'boolean',
+      },
+    },
+    examples: [
+      { key: 'testGroup' },
+      { key: 'testGroup', label: 'Test Group', emphasize: true },
+    ],
+    antiExamples: [
+      { example: { label: 'test label' }, reason: 'key is required' },
+    ],
+    additionalProperties: false,
+  },
+  [KeySchema],
+);