`retainOnArchive`, a volatile field of the worktree service's Config, skips
cleanup admission while it is on; it is read at each archive, so a change
applies to later archives only. The service keeps its instance off the
generated Settings pages, and the Forge client draws the switch as the
`plugins.row.config` page of the bundle's `worktree` row, staged through
the shared Plugins form until one explicit save.
Docs: the worktree, Forge, and bundle READMEs, the archive-worktrees
upgrade guide, the config and client catalogs, and the
explicit-worktree-creation note.
Yichen Jiang
481641b1b9