Add ClearLine() to UI implementations

internal/runner/ui.go

@@ -42,6 +42,10 @@ func (u *runnerUI) Interactive() bool {
 	return false
 }
 
+func (u *runnerUI) ClearLine() {
+	// NO-OP - noninteractive
+}
+
 // Output outputs a message directly to the terminal. The remaining
 // arguments should be interpolations for the format string. After the
 // interpolations you may add Options.

internal/runner/ui_multi.go

@@ -37,6 +37,12 @@ func (u *multiUI) Input(input *terminal.Input) (string, error) {
 	return term.Input(input)
 }
 
+func (u *multiUI) ClearLine() {
+	for _, u := range u.UIs {
+		u.ClearLine()
+	}
+}
+
 func (u *multiUI) Interactive() bool {
 	for _, u := range u.UIs {
 		if u.Interactive() {