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.

vendor/zapier-platform/packages/schema/README.md

@@ -0,0 +1,31 @@
+# Zapier Platform Schema
+
+This is the schema for Zapier integrations.
+
+For documentation:
+
+- [Platform Docs](https://docs.zapier.com/platform)
+- [CLI Reference](https://github.com/zapier/zapier-platform/blob/main/packages/cli/docs/cli.md)
+- [Schema Reference](https://github.com/zapier/zapier-platform/blob/main/packages/schema/docs/build/schema.md)
+
+## Development
+
+See [CONTRIBUTING.md](https://github.com/zapier/zapier-platform/blob/main/CONTRIBUTING.md) and [ARCHITECTURE.md](https://github.com/zapier/zapier-platform/blob/main/packages/schema/ARCHITECTURE.md) of this package in particular.
+
+Useful commands:
+
+- `pnpm` to install packages and get started
+- `pnpm lint` to lint code
+- `pnpm test` to run tests
+- `pnpm smoke-test` to run smoke tests
+- `pnpm coverage` to run tests and display test coverage
+- `pnpm validate` to run tests, smoke tests, and linter
+- `pnpm export` to update the exported-schema (even if only the version changes)
+- `pnpm docs` to update docs (even if only the version changes)
+- `pnpm build` to update docs and the exported-schema (even if only the version changes)
+
+## Publishing
+
+Only do this after merging your PR to `main`.
+
+- `pnpm version --[patch|minor|major]` will pull, test, update exported-schema, update docs, increment version in package.json, push tags, and publish to npm