Ask Slava for next priority during working hours

Subtask of nightly reflection 2026-09-17. Send Slava a single concise Slack DM asking what to prioritize next, unless a new fleet-task arrives first. Gate via check-dm-quiet.sh/check-dm-mute.sh and record via record-dm.sh. Respect DM quiet guard; do not send before 06:30 UTC (08:30 Warsaw).