- agent-job image: add neovim, tmux, less, unzip, wget, locales for the
interactive shell (tmux powers cross-reconnect session persistence)
- Wire NEXT_PUBLIC_SPOON_AGENT_WORKER_WS_URL as a build arg (Dockerfile +
compose.yml) since NEXT_PUBLIC vars are inlined at build time
- docs/agent-terminal.md: architecture, env, nginx WS exposure, dev testing,
security; note the build-time var in docs/compose.prod.yml
Gabriel Brown