Add Word Hunt environment for training models on 4x4 letter grids

- Trie-based solver, official scoring, normalized rewards
- Configurable token limit and detailed README with dictionary download link
- Removes large Dictionary.txt from tracking and adds ignore rules
- All tests pass and pre-commit hooks are clean

environments/community/word_hunt/__init__.py

@@ -0,0 +1,9 @@
+"""
+Word Hunt Environment Package
+"""
+
+from .word_hunt_config import WordHuntEnvConfig
+from .word_hunt_env import WordHuntEnv
+from .word_hunt_solver import WordHuntSolver
+
+__all__ = ["WordHuntEnv", "WordHuntEnvConfig", "WordHuntSolver"]