Closes#152 problem B (schedule history API drops error detail).
Two tiny changes:
1. scheduler.fireSchedule now writes lastError into activity_logs.error_detail
when inserting the cron_run row. Previously the column was left NULL even
on failure because the INSERT didn't include it.
2. schedules.History SELECT now reads error_detail and includes it in the
JSON response under error_detail. Frontend + audit cron can now display
"why did this run fail" instead of just "status=error".
No schema change — activity_logs.error_detail already exists from
migration 009. This just starts using the column.
Problem A of #152 (Research Lead ecosystem-watch 50% error rate on its
own) is a separate ops investigation and stays open.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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