agents anti-pattern bandit contexts dbg debugging deprecated docs ecto elixir elixir-1.14 elixir-1.15 elixir-1.16 elixir-1.17 elixir-1.18 erlang erlang-27 ex-unit formatter gen-server heex heroicons hex hexdocs iex live-debugger live-view live-view-0.18 live-view-0.20 live-view-1.0 live-view-js liveview logging metaprogramming mix otp phoenix phoenix-1.7 phoenix-1.8 processes protocols recon refactoring streams telemetry testing testing-live-view timer tracing types verified-routes vim