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/docs-dev/README.md

@@ -0,0 +1,18 @@
+# Development Quick Reference
+
+This directory provides quick reference information for both human developers and AI tools working on the Zapier Platform codebase.
+
+## Documentation Map
+
+### Existing Documentation (main repository docs)
+- **[README.md](../README.md)** - Repository overview and all documentation links
+- **[ARCHITECTURE.md](../ARCHITECTURE.md)** - Repository structure and technical organization
+- **[CONTRIBUTING.md](../CONTRIBUTING.md)** - Setup, testing, development workflow, and pnpm linking
+
+### Quick Reference (this directory)
+- **[install-dev.md](install-dev.md)** - Development CLI setup and aliases
+- **[commands.md](commands.md)** - Command cheat sheet organized by task
+- **[package-info.md](package-info.md)** - Package purposes and key relationships
+
+## For AI Tools
+AI tools should reference both the existing documentation and these quick reference files to avoid duplicating information while getting task-oriented summaries.