feat(stealth): embeddable evasion init script with apply hints

internal/stealth/script_test.go

@@ -0,0 +1,21 @@
+package stealth
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestStealthScript(t *testing.T) {
+	res := StealthScript(ScriptParams{Engine: "playwright"})
+	if res.Script == "" {
+		t.Fatal("empty script")
+	}
+	for _, want := range []string{"navigator.webdriver", "languages", "WebGL", "chrome"} {
+		if !strings.Contains(res.Script, want) {
+			t.Fatalf("script missing %q", want)
+		}
+	}
+	if res.Apply.How == "" || len(res.IncludedEvasions) == 0 {
+		t.Fatalf("missing apply metadata: %+v", res)
+	}
+}