v1.31.0

Added

• Persistent incident log. The monitor now appends every alert-worthy
  event (node down/recovered, failed Healthchecks pings, disk-low, monitor
  restarts) to /state/events.log on the dashboard_state volume, so
  incident history survives container restarts and host reboots — docker logs doesn't. ./stack events prints it. Naive size cap: over 1 MB the
  newest half is kept.

Fixed

• Healthchecks pings no longer fail silently on a bad Tor exit. The
  dead-man ping rides Tor; an exit answering with an HTTP error page counted
  as delivered, so the 5-minute ping clock advanced and Healthchecks.io
  missed pings with nothing in the logs — showing up as random "down" flaps
  while the node was healthy. Non-200 responses now count as failures: the
  monitor retries every minute (on a fresh circuit) until one lands, and
  logs the failure to the incident log.