build: pin transformers<5.0.0 to avoid breaking changes

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: Lawhy

pyproject.toml

@@ -24,6 +24,7 @@ dependencies = [
     "strands-sglang>=0.1.2",
     "strands-agents-tools",
     "boto3>=1.26.0",
+    "transformers>=4.0.0,<5.0.0",
     "datasets",
     "math-verify>=0.8.0",
     "click>=8.0.0",