Recycle Roro

Create a script and UI for a recycle roro who can be offered items, then gives the player an item after 10 items have been given.
* Reappropriate the bartering UI to accept a single item at a time and not give an item when it does
* Add new tag `#Recycle` to trigger this through dialogue
* Set the NPC's barter flag to true after 10 items have been given

Start by locating the existing bartering UI, dialogue tag handling, and NPC barter-flag logic referenced in the issue. Trace how an item is offered and how rewards are granted, then verify that the new #Recycle flow accepts one item at a time, waits for 10 items, and enables the NPC barter flag before rewarding the player.

Written by the indexing model from the issue text.