ax(node): rename abbreviated dn to dataNode in CreateMinerBundle

AX Principle 1 — predictable names over short names. `dn` is an
opaque abbreviation for a *datanode.DataNode; `dataNode` conveys
the type at a glance without requiring context lookup.

Co-Authored-By: Charon <charon@lethean.io>

pkg/node/bundle.go

@@ -101,13 +101,13 @@ func CreateMinerBundle(minerPath string, profileJSON []byte, name string, passwo
 	}
 
 	// Create DataNode from tarball
-	dn, err := datanode.FromTar(tarData)
+	dataNode, err := datanode.FromTar(tarData)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create datanode: %w", err)
 	}
 
 	// Create TIM from DataNode
-	timContainer, err := tim.FromDataNode(dn)
+	timContainer, err := tim.FromDataNode(dataNode)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create TIM: %w", err)
 	}