NPC refactor (#10122)

Co-authored-by: metalgearsloth <metalgearsloth@gmail.com>

Content.Server/NPC/HTN/HTNCompoundTask.cs

@@ -0,0 +1,16 @@
+using Robust.Shared.Prototypes;
+
+namespace Content.Server.NPC.HTN;
+
+/// <summary>
+/// Represents a network of multiple tasks. This gets expanded out to its relevant nodes.
+/// </summary>
+[Prototype("htnCompound")]
+public sealed class HTNCompoundTask : HTNTask
+{
+    /// <summary>
+    /// The available branches for this compound task.
+    /// </summary>
+    [DataField("branches", required: true)]
+    public List<HTNBranch> Branches = default!;
+}