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.

packages/verae-zapier/triggers/timestamp_completed.js

@@ -0,0 +1,53 @@
+const base = () => process.env.MIDDLEWARE_BASE_URL || 'http://127.0.0.1:3100';
+
+const subscribeHook = async (z, bundle) => {
+  const response = await z.request({
+    method: 'POST',
+    url: `${base()}/zapier/v1/webhooks/subscribe`,
+    body: {
+      targetUrl: bundle.targetUrl,
+      event: 'timestamp.completed',
+    },
+  });
+  return response.data.id;
+};
+
+const unsubscribeHook = async (z, bundle) => {
+  await z.request({
+    method: 'DELETE',
+    url: `${base()}/zapier/v1/webhooks/unsubscribe`,
+    body: {
+      hookId: bundle.subscribeData,
+    },
+  });
+  return {};
+};
+
+const perform = async (z, bundle) => [bundle.cleanedRequest];
+
+const performList = async () => [];
+
+module.exports = {
+  key: 'timestamp_completed',
+  noun: 'Timestamp',
+  display: {
+    label: 'Timestamp Completed',
+    description: 'Triggers when a blockchain timestamp job completes.',
+  },
+  operation: {
+    type: 'hook',
+    perform,
+    performList,
+    performSubscribe: subscribeHook,
+    performUnsubscribe: unsubscribeHook,
+    sample: {
+      event: 'timestamp.completed',
+      jobId: '550e8400-e29b-41d4-a716-446655440000',
+      status: { id: '550e8400-e29b-41d4-a716-446655440000', status: 'completed' },
+    },
+    outputFields: [
+      { key: 'event', label: 'Event' },
+      { key: 'jobId', label: 'Job ID' },
+    ],
+  },
+};