reMending

Description

Prevents combining Mending and Unbreaking on the same item by making these enchantments mutually exclusive.

• Affects anvils, enchanting tables, and all vanilla mechanics that would normally allow stacking both enchantments.
• Ensures consistent behavior across all item types.
• Fully server-side — no client installation required.
• Lightweight implementation with zero dependencies.

A minimalistic tweak to enforce a deliberate trade-off:

Infinite repair (Mending) or extended durability (Unbreaking) — not both.