Allow the creation of recursive HTNs (#30138)

Allow recursive HTNs

Content.Server/NPC/HTN/HTNTask.cs

@@ -3,4 +3,10 @@ namespace Content.Server.NPC.HTN;
 [ImplicitDataDefinitionForInheritors]
 public abstract partial class HTNTask
 {
+    /// <summary>
+    /// Limit the amount of tasks the planner considers. Exceeding this value sleeps the NPC and throws an exception.
+    /// The expected way to hit this limit is with badly written recursive tasks.
+    /// </summary>
+    [DataField]
+    public int MaximumTasks = 1000;
 }