Handle ReAct tool selection failures more gracefully #8114
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We've accumulated a few reports, sometimes with Google models (Gemma, Gemini) but also with Qwen, that when the model wants to
finish, it fails to format that properly. This results in an unnecessary exception, instead of ending execution gracefully.This PR refines the base instructions for
dspy.ReActand handles mid-trajectory failures more gracefully. The final extraction step is still responsible for processing. This results in better respect for the ReAct contract.