meta,args: add missing Include, add iterator to use normal or Readonly the same way

pkg/args/readonly.go

@@ -1,17 +1,25 @@
 package args
 
-import "github.com/ipld/go-ipld-prime"
+import (
+	"iter"
+
+	"github.com/ipld/go-ipld-prime"
+)
 
 type ReadOnly struct {
 	args *Args
 }
 
+func (r ReadOnly) Iter() iter.Seq2[string, ipld.Node] {
+	return r.args.Iter()
+}
+
 func (r ReadOnly) ToIPLD() (ipld.Node, error) {
 	return r.args.ToIPLD()
 }
 
-func (r ReadOnly) Equals(other *Args) bool {
-	return r.args.Equals(other)
+func (r ReadOnly) Equals(other ReadOnly) bool {
+	return r.args.Equals(other.args)
 }
 
 func (r ReadOnly) String() string {