Comprehensive onboarding process to get new developer up and running quickly.

Environment setup: Install required tools, set up development environment, configure IDE/extensions, set up git/SSH keys
Clone and setup: Run pnpm setup at repo root
Decide context: Local only, or remote VPC? (Remote VPC = dev machine in cloud; trade-offs: networking, access, cost, latency. See apps/docu/content/docs/development/dev-environments.mdx.)
Run web/API: pnpm dev (API + Next.js)
Run mobile (optional): pnpm --filter @repo/mobile start (or start:localhost / start:tunnel for remote). See apps/docu/content/docs/development/dev-environments.mdx
Verify: Simulator/device can load the app and reach the API
Project familiarization: Review project structure, understand architecture, read key documentation, set up local database, verify all tests passing, submit first PR

onboard-new-developer