Added array ports and junctions

BEdit/AGENTS.md

@@ -60,6 +60,9 @@ Keep the root of `src/bedit` minimal. New UI modules should go into the relevant
 - Port removal or reorientation must be rejected when it would invalidate an
   existing connection.
 - Connections reference port IDs, never port names.
+- Connection junctions are explicit typed graph objects. Splitting a connection
+  creates one incoming and one outgoing segment; the junction can source further
+  branches without overlapping full connection paths.
 - Graph interaction has separate Pointer and Connect modes. Port hints are only
   visible in Connect mode. Connecting two blocks opens the compatible port-pair
   chooser; explicit port clicks determine its default selection. Connections