Agent Skills: convert-elixir-haskell

Bidirectional conversion between Elixir and Haskell. Use when migrating projects between these languages in either direction. Extends meta-convert-dev with Elixir↔Haskell specific patterns. Use when migrating Elixir projects to Haskell, translating BEAM actor patterns to pure functional programming with IO monad, or refactoring dynamic OTP behaviors to static typed equivalents. Extends meta-convert-dev with Elixir-to-Haskell specific patterns.