Refactor: Decouple ContextSampler from Task; build_qa_turn
#3429
+1,382
−348
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This PR makes two main changes:
ContextSamplernow only samples documents from an iterator - it returns docs, nothing more.build_qa_turn()handles all prompt formatting - a single method that takes a question/choice/answer and returns the formatted messages, making it obvious where delimiters, prefixes, and chat roles are applied