The unit test of the alarm script built its Jinja environment with
autoescape switched off, which code scanning reports as a possible XSS
sink and fails the PR on. The template is a shell script, so
select_autoescape() leaves it unescaped exactly as before, and the finding
no longer applies.
Refs #790
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>