Polls ModemManager for SMS on the EC25's own flash storage, appends each
inbound message to /var/log/van-sms.jsonl, pages via Pushover (shared
van-battery creds), then deletes it from modem storage so it doesn't
silently fill up. MMS can't be decoded (WAP-push notification needs the
carrier's separate MMS APN) — detected and paged as notification-only.
Wired into deploy.sh; installed/verified live on the Pi (backlog SMS
archived + paged successfully) ahead of committing.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
