CLAUDE.md: update UNDF count to 749

defects/nats-server/patch/nats-server-0002-diff-routes-map.patch

@@ -0,0 +1,55 @@
+# UNDF: (leave blank)
+--- a/server/reload.go
++++ b/server/reload.go
+@@ -2605,26 +2605,27 @@ func diffProxiesTrustedKeys(old, new []*ProxyConfig) ([]string, []string) {
+ // diffRoutes diffs the old routes and the new routes and returns the ones that
+ // should be added and removed from the server.
+ func diffRoutes(old, new []*url.URL) (add, remove []*url.URL) {
+-	// Find routes to remove.
+-removeLoop:
+-	for _, oldRoute := range old {
+-		for _, newRoute := range new {
+-			if urlsAreEqual(oldRoute, newRoute) {
+-				continue removeLoop
+-			}
++	// Build O(1)-lookup sets from each list's canonical URL strings.
++	// This replaces two O(R²) nested loops with two O(R) passes.
++	newSet := make(map[string]struct{}, len(new))
++	for _, u := range new {
++		if u != nil {
++			newSet[u.String()] = struct{}{}
+ 		}
+-		remove = append(remove, oldRoute)
+ 	}
+-
+-	// Find routes to add.
+-addLoop:
+-	for _, newRoute := range new {
+-		for _, oldRoute := range old {
+-			if urlsAreEqual(oldRoute, newRoute) {
+-				continue addLoop
+-			}
++	oldSet := make(map[string]struct{}, len(old))
++	for _, u := range old {
++		if u != nil {
++			oldSet[u.String()] = struct{}{}
+ 		}
+-		add = append(add, newRoute)
+ 	}
+
++	for _, oldRoute := range old {
++		if oldRoute != nil {
++			if _, found := newSet[oldRoute.String()]; !found {
++				remove = append(remove, oldRoute)
++			}
++		}
++	}
++	for _, newRoute := range new {
++		if newRoute != nil {
++			if _, found := oldSet[newRoute.String()]; !found {
++				add = append(add, newRoute)
++			}
++		}
++	}
+ 	return add, remove
+ }