The .env line that killed your monitoring: sourcing secrets under set -euo pipefail

One unquoted value in a dotenv file can abort every cron that sources it. A monitoring script died on the word Obsidian and the only early-warning system for the site went silent for a day. Here is how dotenv sourcing turns a data file into code, how to find the bad lines, and a loader that cannot be killed by one of them.