* fix(server): make workspace archive self-healing
Background setup could keep writing after its workspace record was archived, causing disk cleanup to fail and the initiating client to restore a local ghost. Track setup per daemon so archive can stop it, and let repeated archive requests finish residual cleanup after the record has committed.
* fix(server): await setup process termination
Archive must not proceed from setup cancellation until the process-tree terminator has completed. Join that promise to the streamed command's existing finish path so child close cannot release workspace cleanup early.
