feat: add bundle recipes

[dnlbox]

Summary

• add a public Bundle recipe API for deterministic YAML/JSON-driven fixture generation
• wire generate bundle --recipe through the CLI with recipe defaults and CLI override handling
• publish starter recipes and document the workflow

Verification

• pnpm lint
• pnpm typecheck
• pnpm test
• pnpm build
• node dist/cli/index.js generate bundle --recipe examples/recipes/lab-result-basic.yaml --seed 42