Fix duplicate class and annotation placement lint errors

Classes contributed to by more than one file now carry the `partial`
attribute. trains.lua declared its command as `ExpCommand_Artillery`,
which was a copy paste.

`Color.0` and `MapPosition.0` became `.struct` in fmtk 2.1.6.

emmylua rejects `@type` on a function statement or a `do` block, so
those are moved onto the local or replaced by `@param` and `@return`.

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

exp_scenario/module/commands/reports.lua

@@ -11,7 +11,10 @@ local player_has_flag = Roles.player_has_flag
 
 local Reports = require("modules.exp_legacy.modules.control.reports") --- @dep modules.control.reports
 
---- @type Commands.InputParser
+--- @param input string
+--- @param player LuaPlayer
+--- @return Commands.Status
+--- @return LuaPlayer | LocalisedString
 local function reportable_player(input, player)
     local success, status, result = parse_input(input, player, Commands.types.player)
     if not success then return status, result end