Happy Ghast Haste (26.1)

What it does:
- Haste increases a Happy Ghast's sustained flight speed while it is wearing a harness.

Levels (Roman numerals in-game):
- Haste I: ~ sprinting player speed
- Haste II: mid-point speed increase
- Haste III: ~ fastest-horse speed (~14 blocks/sec)

Applies to:
- Happy Ghast Harness only (effect only applies while the ghast is harnessed)

How to obtain:
- Enchanting and loot sources supported by the enchantment datapack system
- Nether Fortress chest loot includes Haste enchanted books
- 26.1 custom librarian trade blueprints now add dedicated Haste I / II / III book trades
- Villager Trade Rebalance common-book pools can also roll Haste books

Notes:
- This pack keeps the original custom enchantment behavior and chest loot hook
- The 26.1 update rebuilds the librarian side around the new data-driven villager trade system


Trade tuning update:
- Haste I is weighted to appear more often in librarian custom trade pools.
- Haste II appears at a middle rate.
- Haste III is the rarest and most expensive of the three.
- Prices now scale at roughly 5-7 emeralds for Haste I, 11-13 for Haste II, and 21 for Haste III, plus a book.
