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.

scripts/gate-not-ready.mjs

@@ -0,0 +1,12 @@
+#!/usr/bin/env node
+/**
+ * Placeholder for gates whose implementation phase is not complete.
+ * Exits non-zero so `gate:all` stops at the correct dependency boundary.
+ */
+
+const phase = process.argv[2] ?? '?';
+console.error(
+  `GATE ${phase} not ready: implement Phase ${phase} per TODO.md, then replace this stub with real tests.`,
+);
+console.error('Do not advance past incomplete gates.');
+process.exit(1);