onlyworlds 0.7.1

• The reset rule says keep. ApiError.is_resync_required and the feed's docstring: on a 409 resync_required, walk again from the start and keep what the local copy holds that the new walk does not name; a reset never empties a copy. They said replace. Keel says keep since PR 104 (the Captain's ruling, 2026-10-20: sharing is forward-only). Nothing in the package acted on it, so no behaviour changes.