The upgrade path in handle_rerun called load_config_file a second time
(already called by detect_existing_install). On the second pass, every
variable is already set, so [ -z "$VAR" ] && VAR="$value" returns
exit code 1 (test fails, && short-circuits). With set -e, the non-zero
exit from the case clause kills the script silently after printing
"[INFO] Upgrading installation..." — no error, no further output.
Removed the redundant load_config_file and load_env_overrides calls.
Both were already executed in main() before handle_rerun is reached.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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