7 daily crons, 2 starvation incidents that triggered the rewrite

Health checks before work, not after, catch silent failures

Queue-low alarm fires at 5 items, not at zero

A cron is ignorable for 3 weeks only when failures are loud

I run 7 GitHub Actions crons every day, and for two months I never looked at them. Then a content queue starved silently and I posted nothing for 4 days before noticing. Here is what I changed so a cron can stay green and be ignorable for 3 weeks straight.