The committed module used systemd.services.docker-prune, which conflicts with the NixOS docker module's own docker-prune unit (`nixos-rebuild build` error: conflicting definition values). The deployed+verified host already runs ci-docker-prune; this syncs the repo so a cold build matches. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>