the addon arc: the AddOns folder opens

- benilla loads real 1.12 addons from Interface/AddOns — TOC, XML and Lua through one loader, with per-addon saved variables, Bindings.xml and the lifecycle events addons expect
- both AddOns screens are in: the character-select list with per-addon enable state, and the ESC menu's in-game list
- the API surface is measured, not guessed — a corpus harness runs hundreds of real 1.12 addons and ranks exactly which globals, templates and verbs they demand
- the Lua dialect is the client's own, read off the binary — 5.0 semantics with the 1.12 additions, and UI source files are bytes, not UTF-8

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

crates/benilla-ui/src/script/cursor.rs

@@ -761,7 +761,7 @@ mod tests {
     fn delete_cursor_item_queues_destroy_and_clears() {
         let mut s = UiScript::new().unwrap();
         s.set_container(0, Some(one_item_backpack()));
-        s.run("C_Container.PickupContainerItem(0, 1)").unwrap();
+        s.run("PickupContainerItem(0, 1)").unwrap();
         assert!(s.cursor_item().is_some());
 
         s.run("DeleteCursorItem()").unwrap();