The question about loan duration can return D3 and seven days. The question about holiday opening must abstain because D1 covers weekdays only. A retrieval score cannot expand the scope of that source.

Critical check: Answers remain within the cited source scope and absent information produces an explicit abstention.

Final project: Deliver the notes, retriever, response rules, evaluation cases and README. Change D3 to a ten-day loan policy in a versioned copy, rerun the relevant tests and demonstrate that the answer cites the updated source.