Pathfinder rework (#11452)

Content.Shared/NPC/PathfindingBoundary.cs

@@ -0,0 +1,23 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.NPC;
+
+/// <summary>
+/// Boundary around a navigation region.
+/// </summary>
+[Serializable, NetSerializable]
+public struct PathfindingBoundary
+{
+    public List<PathfindingBreadcrumb> Breadcrumbs;
+
+    /// <summary>
+    /// Is it a closed loop or is it a special-case chain (e.g. thindows).
+    /// </summary>
+    public bool Closed;
+
+    public PathfindingBoundary(bool closed, List<PathfindingBreadcrumb> crumbs)
+    {
+        Closed = closed;
+        Breadcrumbs = crumbs;
+    }
+}