v0.4.0

0.4.0 - 2025-09-15

Added

• It is now possible to use Storage and AnnouncePolicy implementations which
  can't support Send futures. This is enabled by implementing the new
  LocalStorage and LocalAnnouncePolicy traits instead of Storage and
  AnnouncePolicy. and loading the repo using a LocalRuntimeHandle rather
  than a RuntimeHandle.

Breaking Changes

• Use of a rayon threadpool to run document actors is now gated behind the
  threadpool feature flag and the RepoBuilder::with_concurrency method.
• RuntimeHandle is now much simpler and only requires a spawnfunction
• StorageKey no longer implements FromIterator<String> or
  From<Vec<String>>, use StorageKey::from_parts instead