Why: Second-instance writes stay closed until an independent replay or an admitted CI gate, plus a second host. Those remaining steps needed a durable spec.
Evidence: Task-card evidence rows read the merged PRs, tree equality, CI runs 2783/2810/2816, and Dev main branch protection. Source SELF. Drills were not run.
Impact: Docs and the task card only. Checklist grades stay SELF or not started. The collaboration proposal body stays r2.3.
Refs: docs/release-multi-instance.md
Co-authored-by: Cursor <cursoragent@cursor.com>
