added command execution via !

main_test.go

@@ -1589,5 +1589,21 @@ func TestRenderMDNoColorFallback(t *testing.T) {
   }
 }
 
+func TestDirectShellExecution(t *testing.T) {
+  cmd := "echo direct_exec_test"
+  res := shell(cmd, 10)
+  if !strings.HasPrefix(res, "direct_exec_test") || !strings.Contains(res, "exit: 0") {
+    t.Errorf("direct shell exec failed, got %q", res)
+  }
+
+  // Verify that command stripping preserves arguments
+  u := "! echo hello world"
+  stripped := strings.TrimSpace(strings.TrimPrefix(u, "!"))
+  if stripped != "echo hello world" {
+    t.Errorf("stripped command = %q, want %q", stripped, "echo hello world")
+  }
+}
+
+