diff --git a/src/cv4pve_tui/_lint_probe.py b/src/cv4pve_tui/_lint_probe.py
new file mode 100644
index 0000000..8510e98
--- /dev/null
+++ b/src/cv4pve_tui/_lint_probe.py
@@ -0,0 +1 @@
+import os  # deliberate lint error: CI must fail on this branch