Power-up System

Files
file	arcade_powerup_manager.gd
	Reusable arcade/action power-up lifecycle: field spawns, expiry, collection, and save-friendly active-state dictionaries.
file	powerup_inventory_manager.gd
	Fixed-slot power-up inventory for arcade, platformer, and action games.

Detailed Description

Stores fixed-slot held powerups and reusable arcade field power-up lifecycle state for players, AI, arcade games, platformers, and action games.