Track resolved_by on problems; suppress scan/ingest recreate after manual
resolve; reopen same problem after cooldown; auto-close via heartbeat unchanged.
Co-authored-by: Cursor <cursoragent@cursor.com>
Background scan every 5 min opens rule:host_silence and notifies without
waiting for the next ingest event. CLI job + optional systemd timer.
Co-authored-by: Cursor <cursoragent@cursor.com>