BeggAxe Ultra — resource pack prototype for Minecraft Java 26.x

Visual:
- Legendary 3D netherite/obsidian pickaxe
- Gold trim
- Cyan rune core
- Purple void cracks
- Custom GUI/hand/ground transforms

Expected Custom Model Data selector:
  strings[0] = "beggaxe_ultra"

Server gameplay remains server-side:
- 3x3 mining
- 24 hour expiry
- Efficiency V
- Unbreaking III
- non-resellable/bound

NOTE:
Minecraft's 26.x pack/model formats can change between point releases.
This pack targets the 26.2-era format discussed for this project.
