Merge pull request #3019 from VWS-Python/codex/pylint-useless-suppression-error-20260520

[codex] Make useless Pylint suppressions fail lint

Author: adamtheturtle

pyproject.toml

@@ -204,6 +204,10 @@ MASTER.load-plugins = [
 # Allow loading of arbitrary C extensions. Extensions are imported into the
 # active Python interpreter and may run arbitrary code.
 MASTER.unsafe-load-any-extension = false
+# Return non-zero exit code if useless-suppression is emitted.
+MAIN.fail-on = [
+    "useless-suppression",
+]
 DEPRECATED_BUILTINS.bad-functions = [
     # Use Pylint until Ruff can ban bare builtin calls, or until custom rules
     # make this removable: