fix(slack): 24h cooldown on trends digest to stop backlog spam
Watcher's first sweep produced 250 p7+ items; the 5-min notifier was posting them 15 at a time → channel flood. Cooldown + drain-all-candidates fixes it. See commit message.
Watcher's first sweep produced 250 p7+ items; the 5-min notifier was posting them 15 at a time → channel flood. Cooldown + drain-all-candidates fixes it. See commit message.