FiniteNetherite

Makes Netherite gear finite: on break it downgrades to the diamond equivalent, and it can't be topped up with Mending.

Highlights

• Minimum version bumped to 1.21.1 (now requires Java 17). Builds target 1.21.1–1.21.8.
• Netherite Spear support — handled like the rest of the netherite gear when the item exists on the server.
• Mending XP is no longer wasted on netherite. When a mending orb would repair a netherite item, the XP is redirected to your most-damaged Mending-enchanted item across your hands and armor. With no eligible item, you simply keep the XP.