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.

research/zapier/scratch/veraetime/src/triggers/timestamp_completed.ts

@@ -0,0 +1,65 @@
+import type { Bundle, ZObject } from 'zapier-platform-core';
+
+import { zapierV1 } from '../lib/base.js';
+
+const subscribe = async (z: ZObject, bundle: Bundle) => {
+  const response = await z.request({
+    url: zapierV1(bundle, '/webhooks/subscribe'),
+    method: 'POST',
+    headers: { 'content-type': 'application/json', accept: 'application/json' },
+    json: {
+      targetUrl: bundle.targetUrl,
+      event: 'timestamp.completed',
+    },
+  });
+  return response.data;
+};
+
+const unsubscribe = async (z: ZObject, bundle: Bundle) => {
+  const hookId = bundle.subscribeData?.id;
+  const response = await z.request({
+    url: zapierV1(bundle, '/webhooks/unsubscribe'),
+    method: 'DELETE',
+    headers: { 'content-type': 'application/json', accept: 'application/json' },
+    json: { hookId },
+  });
+  return response.data;
+};
+
+const perform = async (_z: ZObject, bundle: Bundle) => {
+  const payload = bundle.cleanedRequest;
+  if (!payload) return [];
+  return Array.isArray(payload) ? payload : [payload];
+};
+
+const performList = async () => [
+  {
+    id: 'sample-job',
+    event: 'timestamp.completed',
+    jobId: '550e8400-e29b-41d4-a716-446655440000',
+    status: 'completed',
+    result: 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...',
+  },
+];
+
+export default {
+  key: 'timestamp_completed',
+  noun: 'Timestamp',
+  display: {
+    label: 'Timestamp Completed',
+    description: 'Triggers when the middleware finishes a timestamp job (REST Hook).',
+  },
+  operation: {
+    type: 'hook' as const,
+    performSubscribe: subscribe,
+    performUnsubscribe: unsubscribe,
+    perform,
+    performList,
+    sample: {
+      id: 'sample-job',
+      event: 'timestamp.completed',
+      jobId: '550e8400-e29b-41d4-a716-446655440000',
+      status: 'completed',
+    },
+  },
+};