lexxy-realtime 0.5.0

Changed

• yrby-client is a regular dependency instead of being bundled into the
  npm package's dist. Consumers resolve one copy of the provider (shared
  with any direct yrby-client use), and the version relationship is an
  explicit ^0.5.0 instead of whatever was inlined at build time. The
  Rails gem's import-map asset still bakes everything in and is unchanged.

Fixed

• The npm package ships real TypeScript declarations. package.json pointed
  types at dist/lexxy-realtime.d.ts, a file the build never produced, so
  strict TypeScript consumers failed with TS7016. types/lexxy-realtime.d.ts
  now declares Collaboration and setConsumer and re-exports
  YrbyProvider's types from yrby-client. The test suite compiles a strict
  consumer against the declarations, including an @anycable/web consumer.
• The AnyCable example calls createConsumer from @anycable/web. The
  README and the setConsumer docs showed createCable(), whose native
  Cable has no subscriptions and fails as a consumer when an editor
  mounts. The ActionCable-compat createConsumer() is the supported shape,
  pinned by a compile-time check.