Environment configuration

Configuration lives in env/. Copy matching *.example files and keep local files private (0600). env/dev.env contains development settings; env/private.env contains personal Git credentials; env/deploy.env contains server values; env/deploy.local.env contains SSH, registry and deployment ports. CLI build profiles are env/build.development.env and env/build.production.env; env/release.env selects the signing key. Only examples belong in Git. Older projects without env/ may still use root .env files.