Send Stefan INF-11 / PR #87 close-out DM (35-day blocker housekeeping) — verbatim body, evaluate_after 13:00 UTC

Send a single Slack DM to Stefan (channel D0ATM82H3T8) with the verbatim body in `metadata.dm_body`. Execute as ONE tool call: `message action:send target:D0ATM82H3T8 message:<copy verbatim from metadata.dm_body>` Then PATCH this task to status=completed with result=<the Slack ts of the sent message>. DO NOT use target=user:U05QLVC8LM6 — per AGENTS.md hard-coded override, the channel id D0ATM82H3T8 is the only correct target for Stefan DMs. DO NOT compose new content. The body is final. Lease budget = one curl call. EVALUATE_AFTER: 2026-06-13T13:00:00Z — NO_OP until then. Context: this replaces blocked-flip task fc2dc527 which silently failed (LEARNINGS.md 2026-06-13).