Blocklings Revival

### Fixes
- **C2ME / chunk generation crash**
  - Spawning a blockling while chunks were generating (especially with C2ME) could crash the server with a `ConcurrentModificationException` on a C2ME worker thread.
  - Cause: attack-target setup created real entities (e.g. bees). Vanilla bee AI uses the server thread’s `ThreadLocalRandom`, which breaks off-thread.
  - Fix: targets are now classified from `EntityType` / `MobCategory` only. No entities are created during spawn or on C2ME threads. GUI previews are still created on the client only.
- **Held item rendering**
  - Tools and items in a blockling’s hands were misplaced or rotated wrong.
  - Items now follow the arm pose again (original 180° / 190° hand offsets) so pickaxes, swords, and other equipment sit correctly in the stub arms, including left and right hands.
### Additions
- **New type: Pumpkin**
  - Food: pumpkin, carved pumpkin, jack o’lantern, pumpkin pie, pumpkin seeds
  - Spawn: Overworld, under open sky, on grass or farmland, near a pumpkin or pumpkin stem
  - Farming specialist (higher farming speed)
  - Passive: grows nearby crops and pumpkin stems
  - Active (Shift + right-click, empty hand): **Harvest Burst** — accelerates every crop in range
### Compatibility
- **Mystical Agriculture** (optional — only if the mod is installed)
  - Extra Farmer skills appear in the farming tree (Essence Farmer, Mystical Almanac, resow, watering, essence farmland, and related bonuses).
  - Blocklings can farm Mystical Agriculture crops and seeds (crop/seed whitelist after Almanac).
  - They can use watering cans, convert vanilla farmland to essence farmland, and place growth accelerators from their inventory.
  - Inferium / Prosperity / Soulium ores can be mined like other ores.
  - No hard dependency: without Mystical Agriculture, the vanilla skill tree is unchanged.