Fix reward_fn sandbox signature

trainer/reward_fn.py

@@ -19,7 +19,7 @@ def codeforge_reward_fn(prompts, completions, *, task_meta, **kwargs):
         sandbox_files = {**files, **meta["hidden_tests"]}
         try:
             # CodeForge run_sandbox signature:
-            result = run_sandbox(files=sandbox_files, tools=meta["tools"], timeout=10.0)
+            result = run_sandbox(files=sandbox_files, tools=meta["tools"])
             sandbox_score = result.composite_score
         except Exception as e:
             print(f"Sandbox error: {e}")