feat(stealth): humanized interaction plan (bezier + cadence)

internal/stealth/interaction_test.go

@@ -0,0 +1,31 @@
+package stealth
+
+import "testing"
+
+func TestPlanInteraction(t *testing.T) {
+	plan := PlanInteraction(InteractionParams{
+		Actions: []Action{{Type: "click", X: 50, Y: 50}, {Type: "click", X: 150, Y: 150}},
+		Seed:    7,
+	})
+	if len(plan.Steps) == 0 {
+		t.Fatal("no steps")
+	}
+	// monotonic non-decreasing timing
+	last := -1.0
+	for _, s := range plan.Steps {
+		if s.AtMs < last {
+			t.Fatalf("timing not monotonic: %v then %v", last, s.AtMs)
+		}
+		last = s.AtMs
+	}
+	// last mouse step must land on the final target
+	var lastMove *Step
+	for i := range plan.Steps {
+		if plan.Steps[i].Type == "move" {
+			lastMove = &plan.Steps[i]
+		}
+	}
+	if lastMove == nil || lastMove.X != 150 || lastMove.Y != 150 {
+		t.Fatalf("final move did not reach target: %+v", lastMove)
+	}
+}