v1.13.1

Fixed

• ruby: the published 1.13.0 gem still shipped required_ruby_version = [">= 3.2.0", "< 4.0"]
  despite #162, because alef
  regeneration reverted the hand-edit. Fixed at the generator level (alef 0.38.0 defaults to
  ">= 3.2.0" with no upper bound and makes the constraint configurable), so the gem now installs
  on Ruby 4.x.
• elixir: positional JSON-encoded NIF args now forward nil and pre-encoded JSON strings as-is
  instead of double-encoding, matching the keyword-arg path (alef 0.38.0).

Changed

• build: regenerate all bindings against alef 0.38.0. Includes an improved Dart native-library
  loader (env-var override, versioned user cache, explicit errors).