Add reusable remote-builder NixOS module and builder system user.
Server (lazyworkhorse): dispatches aarch64-linux builds to uConsole
uConsole: dispatches x86_64-linux builds to server
The builder user uses the same SSH keypair on both hosts for
symmetric remote building. Generate the key with:
ssh-keygen -t ed25519 -f /etc/ssh/builder_key -N ""
Add the public key to lib/keys.nix (replace PLACEHOLDER).
- Add headless openclaw node systemd service for host execution
- Migrate from nix to lix package manager
- Permit openclaw-2026.3.12 (insecure package warning)
- Use ai-worker user for node service
- Started OpenCode service and verified it's running
- Tested Context7 web search functionality
- Tested DuckDuckGo web search functionality
- Documented web search integration in open_code_server.nix
- Updated ROADMAP and STATE with completion status
- Phase 4 complete, ready for Phase 5: TAK Server Integration
