Type the last of the forward declarations

Locals declared ahead of an assignment inside a callback were inferred
as nil at every use site.

The role event handlers are given a class so the table is not unified
with the other module handler tables.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

exp_commands/module/search.lua

@@ -66,7 +66,7 @@ function Search.on_player_locale_changed(event)
         local ids = player.request_translations(required_translations)
         assert(ids, "Translation ids was nil")
         for i, command_name in ipairs(command_names) do
-            pending[ids[i]] = { locale, command_name }
+            pending[assert(ids[i])] = { locale, command_name }
         end
     end
 end