ELIXIR COMPILER GETS PARALLEL SPEED BOOST

Elixir's parallel type checker now batches cachers more efficiently [1], a targeted optimization that pays off when you're compiling projects with deep dependency chains. The change separates concerns between cache management and type checking logic [1], which means future improvements to either system won't step on each other's toes. This isn't a breaking change, but it does shift how the compiler schedules work under the hood. If you're shipping a large umbrella app or maintaining a library with heavy compile-time dependencies, watch your next `mix compile` timing. The improvement scales with project complexity, so monorepos will see the bigger wins.