- Multi-stage Dockerfile: golang:1.25-alpine builder, alpine:3.21 runtime CGO_ENABLED=0, stripped binary, non-root user - systemd: service unit (hardened), backup oneshot, daily timer (02:00 UTC) - Install script: create user, dirs, config, install units - Updated PROGRESS.md with all completed phases Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>