XeroAntiCheat

Lightweight, accurate anti-cheat for Paper 1.21.x

Latest Updates (v1.1.0)

ReachCheck: Now measures distance to entity bounding box center instead of feet. Eliminates false negatives when attacking tall entities (horses, iron golems, withers). Also switched from distance() to distanceSquared() comparison, removing a Math.sqrt() from the hot path.
AutoClickerCheck: checkPattern() rewritten with zero-allocation two-pass iterator approach. Previously allocated two ArrayList objects on every combat click.
TimerCheck: Removed redundant blink detection from check() method. Blink detection is fully handled by the 5-tick scheduled task. setLastMovePacketTime() retained to feed the task.
KillAuraCheck: Removed unused EntityEffect import.