Blank-slate journey

Read this if you only have the documentation site and zero prior context.

1. Install NENE2 (PHP) → port 8080
2. Install nene2-python → port 8000 (optional parity)
3. Getting started → npm install @hideyukimori/nene2-client@^1.0.0 in your app (no nene2-js clone)

Optional sibling layout for contributors syncing OpenAPI: ../NENE2/, ../nene2-js/, ../nene2-python/.