let any blueprint transfer configuration, not just single-building ones (if the orientation matches)

src/lib/sim/PlacementRules.h

@@ -82,9 +82,11 @@ struct BlueprintGhostResolved
 };
 
 // Classifies one ghost of a blueprint against the current factory state
-// (REQ-UI-BLUEPRINT-OVERLAP, REQ-UI-BLUEPRINT-TRANSFER). `blueprintHoldsOneBuilding` is
-// the blueprint's stored size, counted before locked types are dropped, so the gesture
-// does not change behavior as the player unlocks things.
+// (REQ-UI-BLUEPRINT-OVERLAP, REQ-UI-BLUEPRINT-TRANSFER). `blueprintHoldsOneBuilding`
+// only widens the transfer rule to differently-facing targets; a same-facing target
+// transfers whatever the blueprint's size. It is the blueprint's stored size, counted
+// before locked types are dropped, so the gesture does not change behavior as the player
+// unlocks things.
 //
 // Shared by the ghost coloring and the click path so a preview cannot disagree with what
 // the click then does -- the same reason resolveBeltDragPath is shared.