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/v18.0.6.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 v18.0.6
+
+> Package manager detection from `zapier build`
+
+*Released: 2025-12-24*
+
+The `zapier build` command was harcoded to use `npm install`. As alternate package managers gain adoption, the `zapier build` command will respect your app's package manager of choice.
+It does this by checking the `packageManager` on the package.json file. If it is not defined, it will look for any relevant lock files. If still, none is defined, then will fallback to `npm`.
+
+If you are familiar with using `zapier build` with the flag `--skip-npm-install`, this flag has been renamed to `--skip-dep-install`, but will continue to still work as an alias. In the future, we will remove the `--skip-npm-install` flag.
+
+## cli
+
+* 💅 CLI build respects the integration's package manager ([#1216](https://github.com/zapier/zapier-platform/pull/1216))
+
+## core
+
+None!
+
+## schema
+
+None!
+
+## misc
+
+* 🔨 Bump tmp from 0.2.4 to 0.2.5 ([#1207](https://github.com/zapier/zapier-platform/pull/1207))
+* 🔨 Bump form-data from 4.0.4 to 4.0.5 ([#1208](https://github.com/zapier/zapier-platform/pull/1208))