feat(verifier): add LongPress and Scroll action kinds

internal/verifier/types.go

@@ -10,6 +10,8 @@ const (
 	ActionKindSwipe     ActionKind = "Swipe"
 	ActionKindPressKey  ActionKind = "PressKey"
 	ActionKindWait      ActionKind = "Wait"
+	ActionKindLongPress ActionKind = "LongPress"
+	ActionKindScroll    ActionKind = "Scroll"
 )
 
 // Action is a single UI interaction produced by the spec's action generator.
@@ -28,6 +30,9 @@ type Action struct {
 	DurationMillis int
 	// Key is the logical key name for ActionKindPressKey.
 	Key string
+	// Direction is the scroll direction for ActionKindScroll: one of "up",
+	// "down", "left", "right". Empty for every other kind.
+	Direction string
 }
 
 // LogEntry mirrors a logcat line captured between steps.