feat(browser): auto-commit con 178 cambios

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

functions/browser/cdp_new_tab_background_test.go

@@ -0,0 +1,21 @@
+package browser
+
+import "testing"
+
+func TestCdpNewTabBackground_closedPort(t *testing.T) {
+	// Sin Chrome escuchando esperamos error de red al resolver /json/version,
+	// pero NO panic ni nil-deref. Puerto 1 garantizado cerrado.
+	_, err := CdpNewTabBackground("", 1, "https://example.com")
+	if err == nil {
+		t.Fatal("expected error talking to closed port")
+	}
+}
+
+func TestCdpNewTabBackground_emptyStartURLClosedPort(t *testing.T) {
+	// startURL vacio debe normalizarse a about:blank sin romper; con puerto
+	// cerrado seguimos esperando error de red, no panic.
+	_, err := CdpNewTabBackground("localhost", 1, "")
+	if err == nil {
+		t.Fatal("expected error talking to closed port")
+	}
+}