Write & POST May 31 standup to Slack (12:30-13:30 UTC window) — report substrate auth recovery actions

Daily standup task per LEARNINGS 2026-05-31 04:10 UTC reflection and AGENTS.md End-of-Reflection Wiring Audit item (3). Posting window: 2026-05-31 12:30-13:30 UTC. DoD: Slack DM to Carson (channel D0B0980TR88) + memory/standups/2026-05-31.md. MANDATORY first step: eval $(~/bin/gh-fleet-token.sh) before any gh call. MANDATORY final-refresh step before send: re-read fleet-task resume, latest Slack DM/assistant-thread messages since 2026-05-30 12:30 UTC, latest PR truth via authenticated gh for #11190/#11281/#10870/#11189/#11191/#11198 + older backlog (#9886/#9932/#9353/#10401/#10498/#10499/#10508/#10824), execution state of recovery tasks for Sergey SSO push+PR (AI#2 below) and #11190 close (AI#3 below) and sub-agent template update (AI#4 below). Patch memory/standups/2026-05-31.md so no stale claim survives. Report execution outcomes of recovery tasks. If Sergey SSO PR opened, name it with #number, Linear key, and branch. If #11190 closed, name it. If template update merged, name the PR. If any task is still blocked, report it blocked with explicit reason (do not claim shipped). Include one-line visibility note on the 5-night substrate early-lease pattern (see LEARNINGS 2026-05-31). Send-side timing/status guard: do not send before metadata.trigger_after_utc or 12:30 UTC. If task is leased early, renew/checkpoint or leave queued rather than poison-pilling. After successful Slack send, immediately PATCH this task to completed with slack_ts, delivered_at, and memory_file before any other work. Topic for ping-lockout bookkeeping: standup-2026-05-31. CHECKLIST-CONTACT Gates 1-8 must run before send. Pre-staged body path: memory/standups/2026-05-31.md