Build Module Studio application composition

registry/components.json

@@ -291,6 +291,23 @@
       "domContract": ["nodedc-status"],
       "summary": "Semantic status pill whose tone is independent from the application accent."
     },
+    {
+      "id": "drag-drop",
+      "status": "baseline",
+      "package": "@nodedc/ui-react",
+      "exports": ["DragHandle", "DragDropRoot", "DraggableItem", "DropZone", "SortableScope", "SortableItem", "SortableList"],
+      "domContract": ["nodedc-drag-handle"],
+      "summary": "Engine-derived handle-only drag, transfer and sortable primitives with the canonical six-dot grip and a 6 px activation threshold.",
+      "behavior": ["handle-only drag", "cross-list transfer with explicit overlap acceptance", "vertical-axis reorder", "drop-zone state", "keyboard attributes from dnd-kit"],
+      "rules": [
+        "The six-dot handle is the only drag initiator; clicking the row keeps its normal navigation or selection action.",
+        "Sortable rows are visually constrained to the vertical axis and cannot pull their layout horizontally.",
+        "A transfer is accepted only when the dragged surface overlaps the destination by at least the consumer-defined threshold; Module Studio uses 20 percent.",
+        "Consumers own domain mutations while the package owns sensors, transforms, accessible drag attributes and geometry.",
+        "Repeated page-template drops create distinct application page instances instead of consuming the source template.",
+        "A reordered application page array is the single source of truth for both composition and navigation order."
+      ]
+    },
     {
       "id": "inspector",
       "status": "baseline",