Mc1.21.1/neoforge/dev

[Starior]

• Refactored Crushing Wheel Fortune to use an effective pair level L = (F1 + F2) / 2, persisted in controller NBT as EffectiveFortuneLevel, and applied a crusher-specific expected roll model at 0.8 * (1/(L+2) + (L+1)/2) (~20% below vanilla-style reference).
• Added Silk Touch processing behavior for Crushing Wheels: per input roll, return one input item with 5% chance if one wheel has Silk Touch, or 10% if both wheels have Silk Touch; persisted wheel Silk count in NBT as SilkTouchWheelCount.
• Added an anvil restriction for machine block items so enchanting only works with a single item in the left slot (count > 1 is blocked by clearing result).
• Added custom anvil merge support for Fortune + Silk Touch on Crushing Wheels, with pair detection in both directions and custom anvil cost multiplier x4.
• Added scoped compatibility override for the Fortune/Silk conflict using EnchantmentMixin + AnvilCompatibilityContext, so compatibility is lifted only during the intended anvil flow (not globally).
• Extended Crushing Wheel detection for anvil logic to include modded wheel variants via item tag c:create/crushing_wheels.
• Added a small crusher-side optimization: before doing enchantment registry lookups for wheel/controller sync, it now checks whether either wheel has any enchantments (mayHaveAnyEnchantments), and skips the expensive lookup/merge path when both are empty.

[cotrin8672]

Thanks for the PR!
The enchantability of items is intended to be controlled via the tag-based system in mc 1.21.1, so the IItemExtension mixin should not be needed. Please use the tag-based approach instead.

[cotrin8672]

Is it okay if I reopen and merge this?

[Starior]

I think I did what you asked with the tag
assigning ENCHANTABLE_MECHANICAL_ to blocks of other mods
But I completely understood your approach of creating a separate ENCHANTABLE_MECHANICAL_ for each block.
So, when placed in the game, the enchanted dndecor crushing wheel looks like a standard create block with glint. But when destroyed and in the inventory, it will appear as an enchanted dndecor crushing wheel.
So, I've settled on this implementation.

And I'm trying out the implementation of leaving the original block in the world and storing the enchantments in its BlockEntity in another branch.