Poll for run completion every 5 minutes instead of checking once

The one-shot VERIFY_DELAY_MINUTES check was too rigid: MassPrice's
processing time varies widely in practice (observed ~1 to over 20
minutes, and its queue can back up further under load — confirmed
live, a run still sitting in "Queued" 15+ minutes in), so a single
check window either misses slow-but-fine completions or has to be set
needlessly long.

Replaced with a poll loop: scheduler.py reschedules another one-off
check every VERIFY_POLL_MINUTES (default 5) until automation's
check_completion() reports "complete", up to VERIFY_MAX_ATTEMPTS
(default 12, ~1 hour) before giving up and marking "not_confirmed" for
good. verify_run() is split into a pure check_completion() (no storage
side effects) so scheduler.py's loop owns the retry/give-up decision;
automation.py just answers "is it done yet".

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H6TgffxTvYhqxykAbVQg2v

docker-compose.yml

@@ -16,7 +16,8 @@ services:
       - LOGIN_PASSWORD=${LOGIN_PASSWORD}
       - SECRET_KEY=${SECRET_KEY}
       - TZ=${TZ:-America/Phoenix}
-      - VERIFY_DELAY_MINUTES=${VERIFY_DELAY_MINUTES:-10}
+      - VERIFY_POLL_MINUTES=${VERIFY_POLL_MINUTES:-5}
+      - VERIFY_MAX_ATTEMPTS=${VERIFY_MAX_ATTEMPTS:-12}
       - GMAIL_USER=${GMAIL_USER:-}
       - GMAIL_APP_PASSWORD=${GMAIL_APP_PASSWORD:-}
       - ALERT_EMAIL=${ALERT_EMAIL:-}