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/2025/v17.3.1.md

@@ -0,0 +1,24 @@
+> ## 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 v17.3.1
+
+> Regression bug fixes with `zapier build`.
+
+*Released: 2025-07-17*
+
+## cli
+
+* 🐛 Fix regression bugs with `zapier build --skip-npm-install`, where:
+  * it can miss local packages files when building in a Lerna monorepo ([#1068](https://github.com/zapier/zapier-platform/pull/1068))
+  * it can fail with "Configuration property ... is not defined" when [config](https://www.npmjs.com/package/config) package is used ([#1071](https://github.com/zapier/zapier-platform/pull/1071))
+* 💅 Improve some error messages in `zapier build` ([#1070](https://github.com/zapier/zapier-platform/pull/1070))
+
+## core
+
+* 💅 Improve the error message when the app module fails to import ([#1070](https://github.com/zapier/zapier-platform/pull/1070))
+
+## schema
+
+None!