BOT_FIRE_CONCURRENCY (8) — pg-boss worker pool size, gates max
accounts firing fan-outs in parallel.
BOT_GROUP_CONCURRENCY (3) — per-account parallel group sends; parts
within a group stay serial so chat order is preserved.
BOT_MAX_SEND_PER_MINUTE (40) — per-account token-bucket rate.
Defaults are tuned for an established WhatsApp account
(~30-60 msg/min safe band).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>