End-of-day (20:00 Central) check of campaign deliverability across both sending
pools (main out05-09 + healthcare hcout). Sends a Telegram alert ONLY when there
is a reputation problem -- delivery below 65% or a spam/policy-block (550-5.7.1)
spike above 150/day -- so healthy days stay silent. Reuses the existing
TELEGRAM_BOT_TOKEN/CHAT_ID from /opt/performancewest/.env. Logs every run to
/var/log/pw-warmup-healthcheck.log for history. Excludes internal/probe noise so
the delivery figure reflects real external recipients.
