- AlertState.update() now resets last_notification when the alert level
changes, so a WARNING→CRITICAL escalation restarts the reminder interval
rather than inheriting a nearly-expired timer.
- _dispatch_to_channel() bypasses min_level for RECOVER, so recovery
notifications are delivered even after a server restart when
_alerted_channels is empty and the fallback dispatch path is used.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>