Document the full setup required for Ava to run the orchestrator:
- npm packages in /var/lib/coders
- Symlinks in /usr/local/bin (node, bash, jq, bc, gitlint, bild)
- /run/secrets/ava.env permissions
- direnv allow for the repo
- git config for ava user
- OpenRouter API key usage (--api-key explicit)
This should be in a README or runbook so the setup can be reproduced.