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-middleware/test/helpers.js

@@ -0,0 +1,93 @@
+/**
+ * Shared test helpers — isolated store + seed tenants.
+ */
+
+import { mkdtempSync, rmSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { setStoreForTests, loadStore, emptyStore, persist, getStore } from '../src/store/db.js';
+import { createTenant } from '../src/store/tenants.js';
+import { config } from '../src/config.js';
+
+/**
+ * Point store at a temp file and reset memory.
+ * @returns {{ dir: string, storePath: string, cleanup: () => void }}
+ */
+export function useTempStore() {
+  const dir = mkdtempSync(join(tmpdir(), 'verae-mw-'));
+  const storePath = join(dir, 'store.json');
+  config.storePath = storePath;
+  setStoreForTests(null);
+  loadStore(storePath);
+  // ensure empty
+  setStoreForTests(emptyStore());
+  persist(storePath);
+
+  return {
+    dir,
+    storePath,
+    cleanup: () => {
+      setStoreForTests(null);
+      try {
+        rmSync(dir, { recursive: true, force: true });
+      } catch {
+        /* ignore */
+      }
+    },
+  };
+}
+
+/**
+ * Seed a free-plan tenant with known credentials (mock Verae).
+ * @param {object} [overrides]
+ * @returns {{ tenant: object, apiKey: string }}
+ */
+export function seedFreeTenant(overrides = {}) {
+  return createTenant({
+    id: overrides.id ?? 'tenant-test-free',
+    name: overrides.name ?? 'Test Free',
+    plan: 'free',
+    veraeUsername: overrides.veraeUsername ?? 'zapuser',
+    veraePassword: overrides.veraePassword ?? 'zappass',
+    metadata: { audience: 'test' },
+    ...overrides,
+  });
+}
+
+/**
+ * Seed a pro tenant (batch allowed).
+ */
+export function seedProTenant() {
+  return createTenant({
+    id: 'tenant-test-pro',
+    name: 'Test Pro',
+    plan: 'pro',
+    veraeUsername: 'prouser',
+    veraePassword: 'propass',
+    metadata: { audience: 'test' },
+  });
+}
+
+/**
+ * Seed enterprise with contract.
+ */
+export function seedEnterpriseTenant() {
+  return createTenant({
+    id: 'tenant-test-ent',
+    name: 'Test Enterprise',
+    plan: 'enterprise',
+    veraeUsername: 'entuser',
+    veraePassword: 'entpass',
+    contract: {
+      includedTimestamps: 10,
+      includedVerifications: 10,
+      batch: true,
+      batchMaxItems: 5,
+      requestsPerMinute: 100,
+      allowOverage: false,
+    },
+    metadata: { audience: 'enterprise' },
+  });
+}
+
+export { getStore, config };