Write & POST July 10 standup to Slack (12:30-13:30 UTC window) — queue-for-N+2, template-enforces-N+2, substrate_leak_scrub

Cold-start standup for July 10 2026. Trigger 2026-07-10T12:30Z. Compose in memory/standups/2026-07-10.md then Slack send to Carson DM (D0B0980TR88). Apply COMPOSE_GUARD_DO_NOT_SEND substrate_leak_scrub before send (drop or move to result.substrate_notes any line matching /Cross-context|substrate|binding denied|retry_count|heartbeat recovery|poison[- ]?pill|lease[- ]?expired|webchat.?slack/i). Report kai_owned_active, fleet_authored_open, PR #12919 state summary (if still open — with special note if a THIRD merge-conflict-fix happened between reflection and standup), any Carson-blocking items. Runtime N+2 queue-for-N+2 rule remains: on complete, queue July 12 standup.