- Scoreboard: added player/max placeholders
- Performance: optimized move and block check events
- Countdown: refactored to BukkitRunnable for reliability
- Fix: arena name comparison now uses equals()
- Fix: improved ID generation and world unloading
- Fix: scoreboard task is now synchronous (no more async access errors)
- Add: block selection permissions + updated GUI
- Add: auto-create new arena when first one fills up