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/v18.6.0.md

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+> ## 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 v18.6.0
+
+> New `invoke auth template` and `invoke auth render` commands for inspecting an app's auth request shape
+
+*Released: 2026-05-05*
+
+This release adds two new commands that let you inspect and render the authentication request your app produces. They run your app's middleware (`beforeRequest`, `getAccessToken`, etc.) with placeholder credentials and capture the resulting auth request shape (headers, query params, and body) without making a real network call.
+
+`zapier-platform invoke auth template` returns the static template (with `{{placeholders}}` for auth fields). `zapier-platform invoke auth render` substitutes real auth data from .env into that template and returns the final request.
+
+## cli
+
+* 🎉 Add `invoke auth template` and `invoke auth render` commands ([#1282](https://github.com/zapier/zapier-platform/pull/1282))
+
+## core
+
+* 🎉 Add `getAuthTemplate` and `renderAuthTemplate` Lambda commands ([#1282](https://github.com/zapier/zapier-platform/pull/1282))
+
+## schema
+
+None!