List every node's children one way

authored and named differed only in whether a "..path" binding was skipped,
which made two spellings of one question: what does this node contain? They
could never disagree — loadDir rejects a category or folder carrying the
prefix, so a group's children are never bindings, and TestReferenceErrors
pins both rejections.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

reference.go

@@ -148,7 +148,7 @@ type namedNode struct {
 func contained(n node) []namedNode {
 	switch n := n.(type) {
 	case *group:
-		return authored(n.children)
+		return named(n.children)
 	case *choice:
 		out := make([]namedNode, len(n.items))
 		for i, it := range n.items {
@@ -164,7 +164,8 @@ func contained(n node) []namedNode {
 
 // named skips a bound {..path} key: it is a render edge, not containment, so using
 // it as a path segment would report a node under a path that does not reach it. Only
-// a template's fields hold bindings, so group children go through authored.
+// a template's fields hold bindings — loadDir rejects a category or folder carrying
+// the prefix — so this one skip serves a group's children too.
 func named(m map[string]node) []namedNode {
 	out := make([]namedNode, 0, len(m))
 	for _, name := range sortedNames(m) {
@@ -176,14 +177,6 @@ func named(m map[string]node) []namedNode {
 	return out
 }
 
-func authored(m map[string]node) []namedNode {
-	out := make([]namedNode, 0, len(m))
-	for _, name := range sortedNames(m) {
-		out = append(out, namedNode{name: name, node: m[name]})
-	}
-	return out
-}
-
 func sortedNames(m map[string]node) []string {
 	names := make([]string, 0, len(m))
 	for name := range m {