fix(reminders): rescan definitions before startup alerts

src/Netclaw.Actors/Reminders/ReminderManagerActor.cs

@@ -105,6 +105,10 @@ protected override void PreStart()
             return;
         }
 
+        // The store can be constructed before all persisted files are present.
+        // Rescan at the actor's startup boundary so schema alerts reflect the
+        // authoritative on-disk state rather than constructor timing.
+        _definitionStore.List();
         EmitDroppedInvalidDefinitionAlerts();
         EmitRejectedLegacyDefinitionAlerts();