Agent Skills: convert-elixir-elm

Bidirectional conversion between Elixir and Elm. Use when migrating projects between these languages in either direction. Extends meta-convert-dev with Elixir↔Elm specific patterns. Use when migrating server-side Elixir logic to frontend applications, translating BEAM concurrency patterns to The Elm Architecture, or refactoring Elixir codebases for browser-based UI. Extends meta-convert-dev with Elixir-to-Elm specific patterns.