Integrate oh-my-opencode-slim as an opt-in feature via INSTALL_OMOS build arg. A single build arg installs Bun, tmux, and the plugin; runtime activation is controlled by ENABLE_OMOS and related env vars in the entrypoint.
Dockerfile with Node.js 22, git, ssh, fzf, ripgrep, fd, non-root user. Entrypoint auto-configures provider from env vars. docker-compose with workspace mount, SSH keys, and persistent data volume.