fix: upgrade dependencies to resolve build failure

requirements.txt

@@ -1,6 +1,6 @@
 # LangGraph Multi-Agent MCTS Demo - Dependencies
 # Optimized for Hugging Face Spaces deployment with trained models
-# Force Rebuild 2025-11-25
+# Force Rebuild 2025-11-25 (Attempt 2: Upgrade to modern versions)
 
 # Core UI Framework
 gradio>=4.0.0,<5.0.0
@@ -9,11 +9,12 @@ gradio>=4.0.0,<5.0.0
 numpy>=1.24.0,<2.0.0
 
 # Machine Learning - Neural Models
-# NOTE: peft 0.10.0 is compatible with transformers 4.40.x
-# Newer peft versions (0.14+) require transformers>=4.46 for modeling_layers module
+# Use modern versions to ensure compatibility
+# transformers>=4.46.0 ensures we have the modern API
+# peft>=0.12.0 ensures compatibility with modern transformers
 torch>=2.1.0
-transformers>=4.40.0,<4.46.0
-peft==0.10.0
+transformers>=4.46.0
+peft>=0.12.0
 accelerate>=0.26.0
 sentence-transformers>=2.2.0