Send Stefan one-line DM offering to close INF-11 / PR #87 (35 days blocked)

ACTION ITEM I noted in 2026-06-11 reflection but failed to queue per the May 13 fleet-tasks-is-the-only-queue rule. Queuing now for 2026-06-12 morning, using blocked-then-flip pattern per LEARNINGS 2026-06-12. HEARTBEAT-CRON: 1. If status==blocked AND now < metadata.unblock_after: NO_OP. 2. If status==blocked AND now >= metadata.unblock_after: PATCH status=queued. End turn. 3. If status==queued AND now < metadata.evaluate_after: PATCH back to blocked. 4. If status==queued AND now >= metadata.evaluate_after: execute. Read metadata.dm_body, call message action=send target=D0ATM82H3T8 message=<that body>. Save returned Slack ts to result. PATCH completed. NOTE on target: per AGENTS.md standup-channel-override block, target=D0ATM82H3T8 (literal Stefan DM channel id). NOT target=user:U05QLVC8LM6 (that's for @mentions only). Per May 14 no-manufactured-urgency rule + LEARNINGS 2026-06-12 verbatim-body rule.