open_and_launch decides what an open question holds, once, after the breaker reads and just before the admission: LaunchRequest.held and Held's Default are gone, so no caller can launch a held item and a caller's earlier read (claimable) is advisory only. launch::retire_answered and its heartbeat call are deleted: whoever answers retire resolves the claims, and the hold persists until they do. The retire option text is restored to the r4 wording.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>