--- name: Secrets in .env files description: User stores credentials in .env files, never in code or git type: feedback --- User stores sensitive credentials (API keys, secrets) in `.env` files next to `docker-compose.yml`. Always create/suggest `.env` + `.gitignore` together. **Why:** User explicitly set up Spotify credentials this way. **How to apply:** When any new secret/credential is added, offer to write it to `.env` and ensure `.gitignore` covers it.