Session files (JSONLs, debug logs, todos, telemetry, group logs) accumulate
unboundedly — especially from daily cron tasks. This adds a cleanup script
that prunes old artifacts while protecting active sessions (read from DB),
and wires it into the main process on a 24h interval.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>