ax(node): rename pr to registry in NewPeerRegistryWithPath

`pr` abbreviates PeerRegistry — violates AX Principle 1
(predictable names over short names). Renamed to `registry`
so the variable is self-describing without context.

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

pkg/node/peer.go

@@ -135,7 +135,7 @@ func NewPeerRegistry() (*PeerRegistry, error) {
 // registry, err := node.NewPeerRegistryWithPath("/tmp/test-peers.json")
 // used in tests to avoid xdg path caching
 func NewPeerRegistryWithPath(peersPath string) (*PeerRegistry, error) {
-	pr := &PeerRegistry{
+	registry := &PeerRegistry{
 		peers:             make(map[string]*Peer),
 		path:              peersPath,
 		stopChan:          make(chan struct{}),
@@ -144,14 +144,14 @@ func NewPeerRegistryWithPath(peersPath string) (*PeerRegistry, error) {
 	}
 
 	// Try to load existing peers
-	if err := pr.load(); err != nil {
+	if err := registry.load(); err != nil {
 		// No existing peers, that's ok
-		pr.rebuildKDTree()
-		return pr, nil
+		registry.rebuildKDTree()
+		return registry, nil
 	}
 
-	pr.rebuildKDTree()
-	return pr, nil
+	registry.rebuildKDTree()
+	return registry, nil
 }
 
 // registry.SetAuthMode(PeerAuthAllowlist) // require pre-registration