Enhance school management and protocol handling by introducing a new worker failure mechanism, ensuring proper cleanup of schools when a worker thread encounters an error. Update the map snapshot protocol to allow larger school data sizes, improving the handling of extensive map layouts. Revise documentation to reflect changes in save intervals and introduce a minimum save interval for better performance. Update tests to validate the new functionalities and ensure robustness in handling large data scenarios.

src/HSchool.Server/Game/GameCommand.cs

@@ -35,4 +35,10 @@ internal abstract record GameCommand
 
     /// <summary>Stops every worker, re-reads the save directory, starts workers from those files.</summary>
     internal sealed record ReloadSaves(TaskCompletionSource Result) : GameCommand;
+
+    /// <summary>
+    /// A worker thread ended on an exception. The supervisor owns the table, so the worker asks
+    /// it to drop the school instead of removing itself.
+    /// </summary>
+    internal sealed record WorkerFailed(int SchoolId) : GameCommand;
 }