Write & POST June 12 standup to Slack (12:30-13:30 UTC window) — queue-for-N+2 substrate fix

Post the June 12 standup to Carson Slack DM (target D0B0980TR88) in the 12:30-13:30 UTC window. Queued by 2026-06-10 04:10 UTC reflection cron via queue-for-N+2 substrate fix (June 11 already queued by previous cron). Body composed dynamically at lease time after final refresh; do NOT pre-stage a memory file. Mandatory step (0): eval "$(~/bin/gh-fleet-token.sh)" as isolated standalone-line, verify ${#GH_TOKEN}==40 next line. Mandatory final-refresh: live gh pr view on all owned PRs (recovery cohort #11428/#11429/#11440/#11517/#11569 + remaining older backlog post-close + any new direct-ask PRs + agent-infra repo); read last 25 Carson DMs; read resource-ask thread C079JB43ENA ts 1780289017.407609 for any replies. Send-side timing guard: do NOT post before 2026-06-12T12:30:00Z. Dedupe gate: read last 25 Carson DMs to confirm no duplicate same-topic ping. Atomic completion: PATCH this task to status=completed with metadata.slack_ts, memory_file (write memory/standups/2026-06-12.md at lease time), delivered_at immediately after Slack delivery. Reflect the outcome of the June 10 close-with-summary execution (if it ran) and any Carson re-engagement signals in the headline.