fix(kubens): improve unset help text and success message

- Print active namespace after unset instead of generic message
- Clarify unset help text to explain it sets namespace to 'default'
- Move --version to last position in help output

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cmd/kubens/help.go

@@ -39,8 +39,8 @@ func printUsage(out io.Writer) error {
   %PROG% -                  : switch to the previous namespace in this context
   %PROG% -c, --current      : show the current namespace
   %PROG% -h,--help          : show this message
-  %PROG% -V,--version       : show version
-  %PROG% -u,--unset         : unset the current context`
+  %PROG% -u,--unset         : unset the namespace choice (set to 'default')
+  %PROG% -V,--version       : show version`
 
 	// TODO this replace logic is duplicated between this and kubectx
 	help = strings.ReplaceAll(help, "%PROG%", selfName())

cmd/kubens/unset.go

@@ -33,11 +33,11 @@ func (_ UnsetOp) Run(_, stderr io.Writer) error {
 		return errors.Wrap(err, "kubeconfig error")
 	}
 
-	_, err := clearNamespace(kc)
+	ns, err := clearNamespace(kc)
 	if err != nil {
 		return err
 	}
-	err = printer.Success(stderr, "Active namespace unset for kubens.")
+	err = printer.Success(stderr, "Active namespace is \"%s\".", printer.SuccessColor.Sprint(ns))
 	return err
 }