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/CLAUDE.md

@@ -0,0 +1,23 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Documentation Reference
+
+### Primary Documentation (read these first)
+- **[README.md](README.md)** - Repository overview, package descriptions, all doc links
+- **[CONTRIBUTING.md](CONTRIBUTING.md)** - Setup, testing workflow, package linking
+- **[ARCHITECTURE.md](ARCHITECTURE.md)** - Repository structure and organization
+
+### Quick Reference (for task-oriented work)
+- **[docs-dev/install-dev.md](docs-dev/install-dev.md)** - Development CLI setup
+- **[docs-dev/commands.md](docs-dev/commands.md)** - Command cheat sheet
+- **[docs-dev/package-info.md](docs-dev/package-info.md)** - Package purposes and relationships
+
+## Claude-Specific Workflow Notes
+
+1. **Documentation updates**: Update existing markdown files (README.md, CONTRIBUTING.md, etc.) or `docs-dev/` files, not this CLAUDE.md
+2. **Testing workflow**: Use `pnpm validate` at root for full validation, or `cd` into specific packages for targeted testing
+3. **TypeScript types**: Generated automatically via husky hooks - no manual intervention needed
+4. **Package development**: Always understand package relationships from `docs-dev/package-info.md` before making changes
+5. **Monorepo commands**: Use pnpm from root; individual packages need `cd` first