Generates milk carton style "missing person" PNG images using gg library
with embedded Go fonts. Tracks inactive members via daily_activity, with
configurable thresholds (MISSING_THRESHOLD_DAYS, MISSING_MAX_DAYS,
MISSING_MIN_MESSAGES, MISSING_EXCLUDE_USERS). Rate limited to 1 carton
per room per day. Derives flavor text characteristics from user stats
and sentiment data. Avatar fetching with 3-tier fallback.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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