SR-U1: children are created before the async override load lands, so their
trigger snapshots kept the deploy default forever after a restart/failover/
enable/sweep start. HandleOverridesLoaded now republishes every changed value
through PublishAndNotifyChildren(evaluateWaiters:false), and skips attributes
a static write touched before the load (newer than the stored row).
SR-M3: PostStop cancels each WaitForAttribute timeout and replies
'instance stopped' instead of leaving scripts to time out and timeouts to
dead-letter.
Joseph Doherty