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/raw/docs/integrations/news/2026/v19.0.0.md

@@ -0,0 +1,31 @@
+> ## Documentation Index
+> Fetch the complete documentation index at: https://docs.zapier.com/llms.txt
+> Use this file to discover all available pages before exploring further.
+
+# What's changed in v19.0.0
+
+> The `zapier` CLI binary has been removed. Use `zapier-platform` instead.
+
+*Released: 2026-05-18*
+
+Version 19.0.0 is a **BREAKING CHANGE** release. Here is a brief breakdown of the main change (**❗ denotes a breaking change**):
+
+## ❗ The `zapier` binary has been removed
+
+The `zapier` command was deprecated in v18.0.0 in favor of `zapier-platform`. v19 completes that transition by removing the old binary entirely.
+
+***
+
+Apart from this major change, here are the detailed release notes for this release (**note that ❗ denotes a breaking change**):
+
+## cli
+
+* ❗ Remove the `zapier` executable; the CLI now ships only `zapier-platform` ([#1299](https://github.com/zapier/zapier-platform/pull/1299))
+
+## core
+
+None!
+
+## schema
+
+None!