A want with `revert` `live` starts the reverted build with no restore, no aside taken and no catch-up, and
applies as any want; without the field a revert with no restore point stays held.
Builds: design 47 G §710 (G-21-provider-and-revert-ask.md, "On the answer"), §300, §567
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h