Detector::Erlang::Cowboy

The tech name without needing an instance, so the registry can be read off the classes themselves rather than from a parallel list.

Cheap filename-only filter the detector pass uses to skip detect on files the detector cannot possibly match. The default true preserves prior behavior (every detector runs on every file). Override with the same predicate the body of detect starts with — e.g., filename.ends_with?(".py") for a Python framework detector — so the detector loop avoids the detect dispatch on files outside the detector's language.

On large codebases (saleor's 4255 .py files) this lifts ~100 virtual detect calls per file out of the hot loop because most detectors' inner first-line is exactly this kind of cheap filename check.

Elixir projects pull Cowboy in through plug_cowboy, but their routes live in Phoenix/Plug routers that the Elixir analyzers already own. Restricting the manifest check to Erlang's own build files keeps mix.exs from lighting this up.