Add 5 pi extensions: pi-subagents, pi-crew, rpiv-pi, pi-interactive-shell, pi-intercom

extensions/rpiv-pi/skills/annotate-guidance/examples/root-nodejs-monorepo.md

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+# Project Overview
+
+Express API + React frontend in a Turborepo monorepo.
+
+## Project map
+
+- `apps/api/` - Express REST API
+- `apps/web/` - React SPA
+- `packages/db/` - Prisma schema and client
+- `packages/ui/` - Shared component library
+- `packages/config/` - Shared configuration
+
+## Commands
+
+| Command | What it does |
+|---|---|
+| `turbo build` | Build all packages |
+| `turbo test` | Run all tests |
+| `turbo lint` | Lint all packages |
+| `turbo dev` | Start dev server |
+| `turbo db:generate` | Regenerate Prisma client after schema changes |
+| `turbo db:migrate` | Run database migrations |
+
+<important if="you are adding or modifying API routes">
+- All routes go in `apps/api/src/routes/`
+- Use Zod for request validation — see `apps/api/src/routes/connections.ts` for the pattern
+- Error responses follow RFC 7807 format
+- Authentication via JWT middleware
+</important>
+
+<important if="you are writing or modifying tests">
+- API: Jest + Supertest, Frontend: Vitest + Testing Library
+- Test fixtures in `__fixtures__/` directories
+- Use `createTestClient()` helper for API integration tests
+- Mock database with `prismaMock` from `packages/db/test`
+</important>
+
+<important if="you are working with client-side state, stores, or data fetching">
+- Zustand for global client state
+- React Query for server state
+- URL state via `nuqs`
+</important>