### Improvements
* Sell confirmation now uses atomic pending-sale transactions with unique IDs so an item is owned by only one state at a time (inventory, pending sale, or active auction)
* Confirm, cancel, inventory close, disconnect, and shutdown recovery are idempotent against double-clicks, lag, and repeated callbacks
* Cancel and collect actions on existing auctions use operation locks to prevent double item returns
* Failed listing validation now safely restores the item (with ground drop if the inventory is full)
* Added sampled debug logging for invalid/repeated pending-sale claims (`debug.pending-sales`)
### Bug Fixes
* Fixed item duplication when cancelling `/ah sell` confirmation (Cancel, GUI close, duration/category re-open, double-click, or disconnect could return the item more than once)
* Pending sell items are now returned correctly on player quit and server shutdown
### Configuration
* `debug.pending-sales` (default: `false`) — when `true`, logs every invalid/repeated pending-sale claim; when `false`, samples only
Developer information
Projects on Modrinth are automatically available through a Maven repository for use with JVM build tools such as Gradle.
maven { name = "Modrinth"; url = "https://api.modrinth.com/maven" }
