brainstorm-server-inotify-systemd-persistent-deployment

obra/superpowers brainstorming server (server.cjs) is session-scoped by default (env-configured BRAINSTORM_PORT, BRAINSTORM_DIR, BRAINSTORM_HOST). It can be deployed as a persistent systemd service on port 17777 with a shared screen_dir at /root/aj-workspace/.brainstorm/screens/. Requires inotify limit raise first. Auto-cleanse policy needed: session-close prunes >24h screens, daily cron at 04:00 prunes >7d screens.