Blood Sword

Implement only these approved requirements: - Register one custom sword with attack damage 9, attack speed 0.8, durability 2000, and netherite ingots as its repair material. - Apply the documented defaults for omitted tool properties: mining speed 6, mining level iron, and enchantability 14. - Use a red blade and dark handle inventory texture. - Create the blood_sword texture: Minecraft-style 16x16 item sprite of a custom sword with a vivid red blade, subtle dark crimson highlights, and a nearly black dark handle with a small muted gray guard; clean pixel-art silhouette on a transparent background.