Defer need-check-nil and clean up stale suppressions

emmylua deserialises an unknown diagnostic code to a catch all that
matches no checker, so every `invisible`, `nil-check` and
`global-element` suppression was silently doing nothing. Renamed to the
emmylua codes. `name-style-check` has no equivalent and is dropped, it
was already disabled under luals.

The `get_tile` suppressions referenced an api typedef bug from 2024
which no longer reproduces.

need-check-nil is deferred rather than disabled on merit: a third of the
407 findings come from MapPosition and BoundingBox being aliased as
`struct|[double, double]`, so every `entity.position.x` reads as
possibly nil. The rest need per site knowledge of runtime invariants.

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

exp_scenario/module/gui/debug/redmew_global_view.lua

@@ -24,7 +24,7 @@ function Public.show(container)
     local left_panel_style = left_panel.style
     left_panel_style.width = 300
 
-    --- @diagnostic disable-next-line invisible
+    --- @diagnostic disable-next-line: access-invisible
     for token_id in pairs(Storage._registered) do
         local header = left_panel.add{ type = "flow" }.add{ type = "label", name = header_name, caption = token_id }
         Gui.set_data(header, token_id)