Spelunker Helmets

## 1.0.0-beta — Initial Release

### Added
- Shapeless crafting recipe: combine any helmet with a light source
- Reverse recipe: remove the light source by placing the helmet alone
- 6 light sources supported:
  - Torch (level 14)
  - Lantern (level 15)
  - Soul Torch (level 10)
  - Soul Lantern (level 10)
  - Candle (flickering ~10-14)
  - Glowstone (level 15)
- Dynamic lighting via light blocks at player eye position
- Light turns off when player is submerged or inside a block
- Realistic candle flame flickering effect
- 3D strap model rendered on top of any helmet
- Inventory icon showing the attached light source
- Compatible with all modded helmets extending ArmorItem
- Preserves durability, enchantments and NBT of the original helmet

### Known Limitations
- Light is client-side only — not visible to other players on a server
- Light is bound to the block grid (no sub-block precision)