GroundZeroCore Resource Pack v28 - Custom Items Only Cleanup

Built from v27.

Fixed:
- Removed generated fallback textures for vanilla Minecraft items.
- Restored vanilla look for items like glass bottles, axes, pickaxes, mushrooms, leaves, scaffolding, ingots, paper, book, etc.
- Only GroundZero custom items keep custom textures.
- Vanilla base item model overrides were removed when they had no GroundZero custom_model_data.
- Vanilla base item model overrides with GroundZero custom_model_data were repaired so the normal item still uses vanilla textures.

Important:
- Custom GroundZero textures remain under:
  assets/minecraft/textures/item/gz/
- Existing systems preserved:
  drugs, police, papers, casino, illegal/crafting items.
- This pack no longer replaces vanilla item textures at root level.

Validation:
{
  "removed_root_vanilla_textures_count": 47,
  "root_item_textures_after": [
    "guard_menu_tool.png"
  ],
  "custom_gz_texture_count": 89,
  "missing_custom_textures": 0,
  "json_errors": 0,
  "vanilla_models_repaired_or_removed_count": 47,
  "drugs_kept": true,
  "police_kept": true,
  "papers_kept": true,
  "casino_kept": true,
  "no_bad_root_glass_bottle": true,
  "no_bad_root_axes": true,
  "no_bad_root_mushrooms": true
}

Removed root vanilla textures:
[
  "amethyst_shard.png",
  "azalea_leaves.png",
  "black_concrete.png",
  "blaze_powder.png",
  "blaze_rod.png",
  "bone_meal.png",
  "book.png",
  "brewing_stand.png",
  "brown_dye.png",
  "brown_mushroom.png",
  "brush.png",
  "cauldron.png",
  "chest.png",
  "clay_ball.png",
  "compass_00.png",
  "composter.png",
  "cookie.png",
  "diamond_axe.png",
  "emerald.png",
  "flower_pot.png",
  "ghast_tear.png",
  "glass_bottle.png",
  "glowstone_dust.png",
  "gold_ingot.png",
  "honey_bottle.png",
  "iron_axe.png",
  "iron_nugget.png",
  "iron_pickaxe.png",
  "knowledge_book.png",
  "magenta_dye.png",
  "nether_star.png",
  "paper.png",
  "prismarine_crystals.png",
  "quartz.png",
  "rabbit_hide.png",
  "red_dye.png",
  "redstone_torch.png",
  "repeater.png",
  "rooted_dirt.png",
  "saddle.png",
  "scaffolding.png",
  "smoker.png",
  "sugar.png",
  "survival_inventory.png",
  "tripwire_hook.png",
  "wheat_seeds.png",
  "white_dye.png"
]

Model cleanup:
[
  "repaired base model amethyst_shard.json with 1 GZ overrides",
  "repaired base model azalea_leaves.json with 1 GZ overrides",
  "repaired base model black_concrete.json with 1 GZ overrides",
  "repaired base model blaze_powder.json with 2 GZ overrides",
  "repaired base model blaze_rod.json with 1 GZ overrides",
  "repaired base model bone_meal.json with 2 GZ overrides",
  "repaired base model book.json with 2 GZ overrides",
  "repaired base model brewing_stand.json with 3 GZ overrides",
  "repaired base model brown_dye.json with 1 GZ overrides",
  "repaired base model brown_mushroom.json with 4 GZ overrides",
  "repaired base model brush.json with 1 GZ overrides",
  "repaired base model cauldron.json with 6 GZ overrides",
  "repaired base model chest.json with 1 GZ overrides",
  "repaired base model clay_ball.json with 1 GZ overrides",
  "repaired base model compass.json with 2 GZ overrides",
  "repaired base model composter.json with 3 GZ overrides",
  "repaired base model cookie.json with 2 GZ overrides",
  "repaired base model diamond_axe.json with 1 GZ overrides",
  "repaired base model emerald.json with 2 GZ overrides",
  "repaired base model flower_pot.json with 3 GZ overrides",
  "repaired base model ghast_tear.json with 1 GZ overrides",
  "repaired base model glass_bottle.json with 4 GZ overrides",
  "repaired base model glowstone_dust.json with 3 GZ overrides",
  "repaired base model gold_ingot.json with 1 GZ overrides",
  "removed model override guard_menu_tool.json",
  "repaired base model honey_bottle.json with 1 GZ overrides",
  "repaired base model iron_axe.json with 2 GZ overrides",
  "repaired base model iron_nugget.json with 1 GZ overrides",
  "repaired base model iron_pickaxe.json with 1 GZ overrides",
  "repaired base model knowledge_book.json with 1 GZ overrides",
  "repaired base model magenta_dye.json with 1 GZ overrides",
  "repaired base model nether_star.json with 1 GZ overrides",
  "repaired base model paper.json with 8 GZ overrides",
  "repaired base model prismarine_crystals.json with 2 GZ overrides",
  "repaired base model quartz.json with 1 GZ overrides",
  "repaired base model rabbit_hide.json with 1 GZ overrides",
  "repaired base model red_dye.json with 2 GZ overrides",
  "repaired base model redstone_torch.json with 1 GZ overrides",
  "repaired base model repeater.json with 1 GZ overrides",
  "repaired base model rooted_dirt.json with 1 GZ overrides",
  "repaired base model saddle.json with 1 GZ overrides",
  "repaired base model scaffolding.json with 3 GZ overrides",
  "repaired base model smoker.json with 4 GZ overrides",
  "repaired base model sugar.json with 4 GZ overrides",
  "repaired base model tripwire_hook.json with 1 GZ overrides",
  "repaired base model wheat_seeds.json with 1 GZ overrides",
  "repaired base model white_dye.json with 1 GZ overrides"
]

Missing custom texture refs:
[]
